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Lune

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OpenCitations Meta: Methodology

OpenCitations Meta: পদ্ধতি

OpenCitations Meta: Methodik

Meta de OpenCitations: Metodología

Méta OpenCitations : Méthodologie

ओपनसाइटेशन्स मेटा: कार्यप्रणाली

OpenCitations メタ: 方法論

OpenCitations Meta: 방법론

OpenCitations Meta: Metodologia

Мета OpenCitations: методология

OpenCitations Metası: Metodoloji

OpenCites Meta: Phương pháp luận

OpenCitations Meta：方法论

Authors:
(1) Arcangelo Massari, Research Centre for Open Scholarly Metadata, Department of Classical Philology and Italian Studies, University of Bologna, Bologna, Italy {arcangelo.massari@unibo.it};
(2) Fabio Mariani, Institute of Philosophy and Sciences of Art, Leuphana University, Lüneburg, Germany {fabio.mariani@leuphana.de};
(3) Ivan Heibi, Research Centre for Open Scholarly Metadata, Department of Classical Philology and Italian Studies, University of Bologna, Bologna, Italy and Digital Humanities Advanced Research Centre (/DH.arc), Department of Classical Philology and Italian Studies, University of Bologna, Bologna, Italy {ivan.heibi2@unibo.it};
(4) Silvio Peroni, Research Centre for Open Scholarly Metadata, Department of Classical Philology and Italian Studies, University of Bologna, Bologna, Italy and Digital Humanities Advanced Research Centre (/DH.arc), Department of Classical Philology and Italian Studies, University of Bologna, Bologna, Italy {silvio.peroni@unibo.it};
(5) David Shotton, Oxford e-Research Centre, University of Oxford, Oxford, United Kingdom {david.shotton@opencitations.net}. Table of Links Abstract and Intro
Related Works
Methodology
Data and services
Discussion
Conclusion, Acknowledgements, and References 5. Discussion As shown in Section 2, when considering only semantic publishing datasets, OpenCitations Meta, which currently includes data from Crossref, DataCite, and the NIH Open Citation Collection (ICite et al., 2022), is first in data volume. Moreover, work is already underway to ingest data from new sources, such as the Japan Link Center (Hara, 2020), the OpenAIRE Research Graph (Atzori et al., 2017), and the Dryad Digital Repository (Vision, 2010). When compared to the OpenAIRE Research Graph, OpenCitations Meta has advantages in terms of functionality: namely the use of OMIDs, globally unique persistent identifiers used internally to identify every entity within OpenCitations Meta. This usage makes it possible to represent and index citations between bibliographic resources that lack an external persistent identifier such as a Digital Object Identifier (DOI). This feature adds significant value for the OpenCitations Indexes, as it allows for the first time the ingestion of many citations which until now were not possible to be characterised, particularly citations between publications from the humanities and social sciences (Gorraiz et al., 2016), and citations involving primary sources, e.g. a statue, a painting, or a codex, which typically lack a persistent identifier. Importantly, having an OMID also permits the identified resource to be assigned a unique URL, for example https://w3id.org/oc/meta/br/061401975837 for omid:br/061401975837. Another feature that, to the best of our knowledge, is only present in OpenCitations Meta is the mechanism for change-tracking management within the provenance information stored in RDF. This information can be queried using the Python timeagnostic-library software (Massari & Peroni, 2022). It can perform time-traversal SPARQL queries, i.e. queries across different snapshots together with provenance information. As far as other bibliographic datasets that do not use Semantic Web technologies go, OpenAlex (Priem et al., 2022) is an important case to consider for comparison with OpenCitations Meta. OpenAlex uses web crawls to add missing metadata, a feature that allows it to automatically correct a higher number of errors appearing in the data of the sources, when compared to OpenCitations Meta. Indeed, currently, the main limitation of OpenCitations Meta concerns the quality of the data, which is strictly dependent on the quality of the sources. Crossref does not double-check the metadata provided by publishers, and thus many errors are preserved. For instance, it is possible to encounter articles published in the future (the metadata available at https://api.crossref.org/v1/works/10.12960/tsh.2020.0006 say that the article will be published in print in 2029). Some of these errors can be corrected automatically without any background knowledge, while others require either the use of web crawlers or manual intervention. While OpenAlex is pursuing the path of web crawls, OpenCitations is working on a framework that will allow the editing and curation of data by trusted human domain experts (such as academic librarians). OpenCitations Meta fulfils its primary purpose by holding the bibliographic metadata required to describe the citing and cited publications involved in the citations within the OpenCitations Indexes. In addition to these bibliographic metadata elements, however, we are well aware that there are additional metadata elements of great importance for the academic community: Abstracts, for text mining, domain and subject field determination, and indexing (even if the full texts of the publications are available open access elsewhere), and Funder IDs, Funding information and Institutional identifiers, essential for determining performance metrics and undertaking research assessment. Once we have completed the provision of our textual search operations, expanded our coverage in the ways indicated, and enhanced the computational infrastructure upon which OpenCitations Meta and the OpenCitations Indexes run, we will proceed to integrate and populate these additional metadata fields. The provision of high-quality bibliographic metadata is a complex and difficult goal to achieve by automated operations, while the scale of the operations precludes manual curation except for a minority of records. No bibliographic dataset is currently able to achieve this goal on its own. For this reason, all the available bibliographic databases should be viewed as complementary. For example, while at the moment OpenAlex provides better quality metadata, OpenCitations Meta has complete provenance data openly available, and enables more complex searches, thanks to the potentialities given by Semantic Web technologies. For example, "Search for all authors who co-authored with Silvio Peroni or Fabio Vitali in conference proceedings that were published by Springer after 2009". Furthermore, OpenAlex is only partially free, since a fee must be paid to make more than a hundred thousand requests per day via the API and to access data updated every hour via the API (instead of every month via the dump)[9]. In contrast, users can make unlimited requests to the latest version of OpenCitations Meta for free. Also, although the OpenAIRE Research Graph currently contains more metadata, such data are released under a CC-BY attribution licence, while the data released by OpenCitations Meta is under a CC0 public domain waiver, permitting complete freedom for reuse, including commercial reuse, and for machine processing without any requirement for attribution. This paper is available on arxiv under CC 4.0 DEED license. Authors: (1) Arcangelo Massari, Research Centre for Open Scholarly Metadata, Department of Classical Philology and Italian Studies, University of Bologna, Bologna, Italy {arcangelo.massari@unibo.it}; (2) Fabio Mariani, Institute of Philosophy and Sciences of Art, Leuphana University, Lüneburg, Germany {fabio.mariani@leuphana.de}; (3) Ivan Heibi, Research Centre for Open Scholarly Metadata, Department of Classical Philology and Italian Studies, University of Bologna, Bologna, Italy and Digital Humanities Advanced Research Centre (/DH.arc), Department of Classical Philology and Italian Studies, University of Bologna, Bologna, Italy {ivan.heibi2@unibo.it}; (4) Silvio Peroni, Research Centre for Open Scholarly Metadata, Department of Classical Philology and Italian Studies, University of Bologna, Bologna, Italy and Digital Humanities Advanced Research Centre (/DH.arc), Department of Classical Philology and Italian Studies, University of Bologna, Bologna, Italy {silvio.peroni@unibo.it}; (5) David Shotton, Oxford e-Research Centre, University of Oxford, Oxford, United Kingdom {david.shotton@opencitations.net}. Authors: Authors: (1) Arcangelo Massari, Research Centre for Open Scholarly Metadata, Department of Classical Philology and Italian Studies, University of Bologna, Bologna, Italy {arcangelo.massari@unibo.it}; (2) Fabio Mariani, Institute of Philosophy and Sciences of Art, Leuphana University, Lüneburg, Germany {fabio.mariani@leuphana.de}; (3) Ivan Heibi, Research Centre for Open Scholarly Metadata, Department of Classical Philology and Italian Studies, University of Bologna, Bologna, Italy and Digital Humanities Advanced Research Centre (/DH.arc), Department of Classical Philology and Italian Studies, University of Bologna, Bologna, Italy {ivan.heibi2@unibo.it}; (4) Silvio Peroni, Research Centre for Open Scholarly Metadata, Department of Classical Philology and Italian Studies, University of Bologna, Bologna, Italy and Digital Humanities Advanced Research Centre (/DH.arc), Department of Classical Philology and Italian Studies, University of Bologna, Bologna, Italy {silvio.peroni@unibo.it}; (5) David Shotton, Oxford e-Research Centre, University of Oxford, Oxford, United Kingdom {david.shotton@opencitations.net}. Table of Links Abstract and Intro Related Works Methodology Data and services Discussion Conclusion, Acknowledgements, and References Abstract and Intro Abstract and Intro Related Works Related Works Methodology Methodology Data and services Data and services Discussion Discussion Conclusion, Acknowledgements, and References Conclusion, Acknowledgements, and References 5. Discussion As shown in Section 2, when considering only semantic publishing datasets, OpenCitations Meta, which currently includes data from Crossref, DataCite, and the NIH Open Citation Collection (ICite et al., 2022), is first in data volume. Moreover, work is already underway to ingest data from new sources, such as the Japan Link Center (Hara, 2020), the OpenAIRE Research Graph (Atzori et al., 2017), and the Dryad Digital Repository (Vision, 2010). When compared to the OpenAIRE Research Graph, OpenCitations Meta has advantages in terms of functionality: namely the use of OMIDs, globally unique persistent identifiers used internally to identify every entity within OpenCitations Meta. This usage makes it possible to represent and index citations between bibliographic resources that lack an external persistent identifier such as a Digital Object Identifier (DOI). This feature adds significant value for the OpenCitations Indexes, as it allows for the first time the ingestion of many citations which until now were not possible to be characterised, particularly citations between publications from the humanities and social sciences (Gorraiz et al., 2016), and citations involving primary sources, e.g. a statue, a painting, or a codex, which typically lack a persistent identifier. Importantly, having an OMID also permits the identified resource to be assigned a unique URL, for example https://w3id.org/oc/meta/br/061401975837 for omid:br/061401975837. Another feature that, to the best of our knowledge, is only present in OpenCitations Meta is the mechanism for change-tracking management within the provenance information stored in RDF. This information can be queried using the Python timeagnostic-library software (Massari & Peroni, 2022). It can perform time-traversal SPARQL queries, i.e. queries across different snapshots together with provenance information. As far as other bibliographic datasets that do not use Semantic Web technologies go, OpenAlex (Priem et al., 2022) is an important case to consider for comparison with OpenCitations Meta. OpenAlex uses web crawls to add missing metadata, a feature that allows it to automatically correct a higher number of errors appearing in the data of the sources, when compared to OpenCitations Meta. Indeed, currently, the main limitation of OpenCitations Meta concerns the quality of the data, which is strictly dependent on the quality of the sources. Crossref does not double-check the metadata provided by publishers, and thus many errors are preserved. For instance, it is possible to encounter articles published in the future (the metadata available at https://api.crossref.org/v1/works/10.12960/tsh.2020.0006 say that the article will be published in print in 2029). Some of these errors can be corrected automatically without any background knowledge, while others require either the use of web crawlers or manual intervention. While OpenAlex is pursuing the path of web crawls, OpenCitations is working on a framework that will allow the editing and curation of data by trusted human domain experts (such as academic librarians). OpenCitations Meta fulfils its primary purpose by holding the bibliographic metadata required to describe the citing and cited publications involved in the citations within the OpenCitations Indexes. In addition to these bibliographic metadata elements, however, we are well aware that there are additional metadata elements of great importance for the academic community: Abstracts, for text mining, domain and subject field determination, and indexing (even if the full texts of the publications are available open access elsewhere), and Funder IDs, Funding information and Institutional identifiers, essential for determining performance metrics and undertaking research assessment. Once we have completed the provision of our textual search operations, expanded our coverage in the ways indicated, and enhanced the computational infrastructure upon which OpenCitations Meta and the OpenCitations Indexes run, we will proceed to integrate and populate these additional metadata fields. The provision of high-quality bibliographic metadata is a complex and difficult goal to achieve by automated operations, while the scale of the operations precludes manual curation except for a minority of records. No bibliographic dataset is currently able to achieve this goal on its own. For this reason, all the available bibliographic databases should be viewed as complementary. For example, while at the moment OpenAlex provides better quality metadata, OpenCitations Meta has complete provenance data openly available, and enables more complex searches, thanks to the potentialities given by Semantic Web technologies. For example, "Search for all authors who co-authored with Silvio Peroni or Fabio Vitali in conference proceedings that were published by Springer after 2009". Furthermore, OpenAlex is only partially free, since a fee must be paid to make more than a hundred thousand requests per day via the API and to access data updated every hour via the API (instead of every month via the dump)[9]. In contrast, users can make unlimited requests to the latest version of OpenCitations Meta for free. Also, although the OpenAIRE Research Graph currently contains more metadata, such data are released under a CC-BY attribution licence, while the data released by OpenCitations Meta is under a CC0 public domain waiver, permitting complete freedom for reuse, including commercial reuse, and for machine processing without any requirement for attribution. This paper is available on arxiv under CC 4.0 DEED license. This paper is available on arxiv under CC 4.0 DEED license. available on arxiv

OpenCitations Meta: Discussion

OpenCitations Meta: আলোচনা

OpenCitations Meta: Diskussion

Meta de OpenCitations: Discusión

Méta OpenCitations : discussion

ओपनसाइटेशन्स मेटा: चर्चा

OpenCitations メタ: ディスカッション

OpenCitations Meta: 토론

OpenCitations Meta: Discussão

Мета OpenCitations: обсуждение

OpenCitations Meta: Tartışma

OpenCites Meta: Thảo luận

OpenCitations Meta：讨论

Authors:
(1) Arcangelo Massari, Research Centre for Open Scholarly Metadata, Department of Classical Philology and Italian Studies, University of Bologna, Bologna, Italy {arcangelo.massari@unibo.it};
(2) Fabio Mariani, Institute of Philosophy and Sciences of Art, Leuphana University, Lüneburg, Germany {fabio.mariani@leuphana.de};
(3) Ivan Heibi, Research Centre for Open Scholarly Metadata, Department of Classical Philology and Italian Studies, University of Bologna, Bologna, Italy and Digital Humanities Advanced Research Centre (/DH.arc), Department of Classical Philology and Italian Studies, University of Bologna, Bologna, Italy {ivan.heibi2@unibo.it};
(4) Silvio Peroni, Research Centre for Open Scholarly Metadata, Department of Classical Philology and Italian Studies, University of Bologna, Bologna, Italy and Digital Humanities Advanced Research Centre (/DH.arc), Department of Classical Philology and Italian Studies, University of Bologna, Bologna, Italy {silvio.peroni@unibo.it};
(5) David Shotton, Oxford e-Research Centre, University of Oxford, Oxford, United Kingdom {david.shotton@opencitations.net}. Table of Links Abstract and Intro
Related Works
Methodology
Data and services
Discussion
Conclusion, Acknowledgements, and References 4. Data and services At the time of its initial release in December 2022, OpenCitations Meta included Crossref (Hendricks et al., 2020), DataCite (Brase, 2010), and the NIH Open Citation Collection (ICite et al., 2022) as its primary sources for the bibliographic metadata describing the publications involved in citations within the following OpenCitations Indexes: COCI (https://opencitations.net/index/coci) (OpenCitations, 2022), DOCI (https: //opencitations.net/index/doci), and POCI (https://opencitations.net/index/poci). From a quantitative point of view, there are within this initial release of OpenCitations Meta 98,243,101 bibliographic entities (fabio:Expression), 309,881,223 authors (pro:author), 2,406,510 editors (pro:editor), 19,076 publishers (pro:publisher), and 659,214 venues (e.g. resources of type fabio:AcademicProceedings, fabio:ExpressionCollection, fabio:Book, fabio:BookSeries, fabio:Journal, fabio:ReferenceBook, or fabio:Series). Thus, on average, each bibliographic resource has three authors. Typically no editor is recorded, as the latter metadata are little used in our sources. In total, the triplestore consists of 3,749,729,755 triples (excluding provenance). Editors and authors have been counted as roles, without disambiguating the individuals holding these roles. Conversely, bibliographic entities, publishers, and venues were counted by OMID. However, for venues (e.g. journals), we have taken an extra precaution: many are duplicated in OpenCitations Meta because they have no identifiers other than the OMID. Therefore, in the figures shown above, we found it reasonable to disambiguate the venues by title in the absence of other identifiers. As shown in Table 2, Springer Science is the publishing entity with the highest number of venues (2097), followed by Elsevier BV (1961) and IEEE (1775). When counting the number of publications, Elsevier is in the lead (16,933,610), followed by Springer Science (11,507,498) and Wiley (7,262,893) in Table 3. Considering the venues in Table 4, Wiley’s ChemInform has the most publications (421,735), followed by Elsevier’s SSRN Electronic Journal (337,223) and Springer’s Journal On Data Semantics (330,093). Table 5 lists all the types of bibliographic resources in OpenCitations Meta. The current dataset contains mostly journal articles (67,904,323), which exceed the number of book chapters in second place (6,476,623) by about ten times, and proceedings articles in third place (5,046,165) by about thirteen times. Table 6, which lists the number of publications per year, shows an increasing trend, with a greater number of publications from year to year. OpenCitations Meta allows the users to explore such data either via SPARQL (https://opencitations.net/meta/sparql) or via an API (https://opencitations.net/meta/ api/v1). In particular, the OpenCitations Meta API retrieves a list of bibliographic resources and related metadata starting from one or more publication identifiers, an author’s ORCID, or an editor’s ORCID. Textual searches are currently under testing and will be released in the future as one further operation of the OpenCitations Meta API. In particular, text searches on titles, authors, editors, publishers, IDs, and venues can be performed. They can also be achieved on volume and issue numbers, provided the venue is first specified. Indeed, searches on multiple fields can be combined using the Boolean conjunction and disjunction operators. For example, once the operation is released, the user will be able to search for all bibliographic resources whose title contains the word “micro-chaos” published either by Philosophical Studies or the Journal of Nonlinear Science: title=micro-chaos&&venue=philosophical%20studies||title=microchaos&&venue=journal%20of%20nonlinear%20science, where “&&” is the conjunction operator, while || is the disjunction operator. Finally, all data and provenance are available as dumps in RDF (JSON-LD) (OpenCitations, 2023b) or CSV format (OpenCitations, 2023a) under a CC0 licence. This paper is available on arxiv under CC 4.0 DEED license. Authors: (1) Arcangelo Massari, Research Centre for Open Scholarly Metadata, Department of Classical Philology and Italian Studies, University of Bologna, Bologna, Italy {arcangelo.massari@unibo.it}; (2) Fabio Mariani, Institute of Philosophy and Sciences of Art, Leuphana University, Lüneburg, Germany {fabio.mariani@leuphana.de}; (3) Ivan Heibi, Research Centre for Open Scholarly Metadata, Department of Classical Philology and Italian Studies, University of Bologna, Bologna, Italy and Digital Humanities Advanced Research Centre (/DH.arc), Department of Classical Philology and Italian Studies, University of Bologna, Bologna, Italy {ivan.heibi2@unibo.it}; (4) Silvio Peroni, Research Centre for Open Scholarly Metadata, Department of Classical Philology and Italian Studies, University of Bologna, Bologna, Italy and Digital Humanities Advanced Research Centre (/DH.arc), Department of Classical Philology and Italian Studies, University of Bologna, Bologna, Italy {silvio.peroni@unibo.it}; (5) David Shotton, Oxford e-Research Centre, University of Oxford, Oxford, United Kingdom {david.shotton@opencitations.net}. Authors: Authors: (1) Arcangelo Massari, Research Centre for Open Scholarly Metadata, Department of Classical Philology and Italian Studies, University of Bologna, Bologna, Italy {arcangelo.massari@unibo.it}; (2) Fabio Mariani, Institute of Philosophy and Sciences of Art, Leuphana University, Lüneburg, Germany {fabio.mariani@leuphana.de}; (3) Ivan Heibi, Research Centre for Open Scholarly Metadata, Department of Classical Philology and Italian Studies, University of Bologna, Bologna, Italy and Digital Humanities Advanced Research Centre (/DH.arc), Department of Classical Philology and Italian Studies, University of Bologna, Bologna, Italy {ivan.heibi2@unibo.it}; (4) Silvio Peroni, Research Centre for Open Scholarly Metadata, Department of Classical Philology and Italian Studies, University of Bologna, Bologna, Italy and Digital Humanities Advanced Research Centre (/DH.arc), Department of Classical Philology and Italian Studies, University of Bologna, Bologna, Italy {silvio.peroni@unibo.it}; (5) David Shotton, Oxford e-Research Centre, University of Oxford, Oxford, United Kingdom {david.shotton@opencitations.net}. Table of Links Abstract and Intro Related Works Methodology Data and services Discussion Conclusion, Acknowledgements, and References Abstract and Intro Abstract and Intro Related Works Related Works Methodology Methodology Data and services Data and services Discussion Discussion Conclusion, Acknowledgements, and References Conclusion, Acknowledgements, and References 4. Data and services At the time of its initial release in December 2022, OpenCitations Meta included Crossref (Hendricks et al., 2020), DataCite (Brase, 2010), and the NIH Open Citation Collection (ICite et al., 2022) as its primary sources for the bibliographic metadata describing the publications involved in citations within the following OpenCitations Indexes: COCI (https://opencitations.net/index/coci) (OpenCitations, 2022), DOCI (https: //opencitations.net/index/doci), and POCI (https://opencitations.net/index/poci). From a quantitative point of view, there are within this initial release of OpenCitations Meta 98,243,101 bibliographic entities (fabio:Expression), 309,881,223 authors (pro:author), 2,406,510 editors (pro:editor), 19,076 publishers (pro:publisher), and 659,214 venues (e.g. resources of type fabio:AcademicProceedings, fabio:ExpressionCollection, fabio:Book, fabio:BookSeries, fabio:Journal, fabio:ReferenceBook, or fabio:Series). Thus, on average, each bibliographic resource has three authors. Typically no editor is recorded, as the latter metadata are little used in our sources. In total, the triplestore consists of 3,749,729,755 triples (excluding provenance). Editors and authors have been counted as roles, without disambiguating the individuals holding these roles. Conversely, bibliographic entities, publishers, and venues were counted by OMID. However, for venues (e.g. journals), we have taken an extra precaution: many are duplicated in OpenCitations Meta because they have no identifiers other than the OMID. Therefore, in the figures shown above, we found it reasonable to disambiguate the venues by title in the absence of other identifiers. As shown in Table 2, Springer Science is the publishing entity with the highest number of venues (2097), followed by Elsevier BV (1961) and IEEE (1775). When counting the number of publications, Elsevier is in the lead (16,933,610), followed by Springer Science (11,507,498) and Wiley (7,262,893) in Table 3. Considering the venues in Table 4, Wiley’s ChemInform has the most publications (421,735), followed by Elsevier’s SSRN Electronic Journal (337,223) and Springer’s Journal On Data Semantics (330,093). Table 5 lists all the types of bibliographic resources in OpenCitations Meta. The current dataset contains mostly journal articles (67,904,323), which exceed the number of book chapters in second place (6,476,623) by about ten times, and proceedings articles in third place (5,046,165) by about thirteen times. Table 6, which lists the number of publications per year, shows an increasing trend, with a greater number of publications from year to year. OpenCitations Meta allows the users to explore such data either via SPARQL (https://opencitations.net/meta/sparql) or via an API (https://opencitations.net/meta/ api/v1). In particular, the OpenCitations Meta API retrieves a list of bibliographic resources and related metadata starting from one or more publication identifiers, an author’s ORCID, or an editor’s ORCID. Textual searches are currently under testing and will be released in the future as one further operation of the OpenCitations Meta API. In particular, text searches on titles, authors, editors, publishers, IDs, and venues can be performed. They can also be achieved on volume and issue numbers, provided the venue is first specified. Indeed, searches on multiple fields can be combined using the Boolean conjunction and disjunction operators. For example, once the operation is released, the user will be able to search for all bibliographic resources whose title contains the word “micro-chaos” published either by Philosophical Studies or the Journal of Nonlinear Science: title=micro-chaos&&venue=philosophical%20studies||title=microchaos&&venue=journal%20of%20nonlinear%20science, where “&&” is the conjunction operator, while || is the disjunction operator. Finally, all data and provenance are available as dumps in RDF (JSON-LD) (OpenCitations, 2023b) or CSV format (OpenCitations, 2023a) under a CC0 licence. This paper is available on arxiv under CC 4.0 DEED license. This paper is available on arxiv under CC 4.0 DEED license. available on arxiv

OpenCitations Meta: Data and services

OpenCitations মেটা: ডেটা এবং পরিষেবা

OpenCitations Meta: Daten und Dienste

OpenCitations Meta: Datos y servicios

Méta OpenCitations : données et services

OpenCitations मेटा: डेटा और सेवाएँ

OpenCitations Meta: データとサービス

OpenCitations Meta: 데이터 및 서비스

OpenCitations Meta: Dados e serviços

Мета OpenCitations: данные и сервисы

OpenCitations Meta: Veriler ve hizmetler

OpenCites Meta: Dữ liệu và dịch vụ

OpenCitations Meta：数据和服务

OpenCitations Meta: Conclusion, Acknowledgements, and References

OpenCitations Meta: উপসংহার, স্বীকৃতি, এবং রেফারেন্স

OpenCitations Meta: Schlussfolgerung, Danksagungen und Referenzen

Meta de OpenCitations: conclusión, agradecimientos y referencias

Méta OpenCitations : conclusion, remerciements et références

ओपनसाइटेशन्स मेटा: निष्कर्ष, आभार और संदर्भ

OpenCitations Meta: 結論、謝辞、参考文献

OpenCitations Meta: 결론, 감사의 말, 참고 문헌

OpenCitations Meta: Conclusão, Agradecimentos e Referências

Мета OpenCitations: заключение, благодарности и ссылки

OpenCitations Meta: Sonuç, Teşekkür ve Referanslar

OpenCites Meta: Kết luận, Lời cảm ơn và Tài liệu tham khảo

OpenCitations Meta：结论、致谢和参考文献

OpenCitations Meta: Abstract and Intro

OpenCitations মেটা: বিমূর্ত এবং ভূমিকা

OpenCitations Meta: Zusammenfassung und Einleitung

Meta de OpenCitations: resumen e introducción

Méta OpenCitations : résumé et introduction

ओपनसाइटेशंस मेटा: सार और परिचय

OpenCitations Meta: 概要と序文

OpenCitations Meta: 초록 및 소개

OpenCitations Meta: Resumo e introdução

Мета OpenCitations: Аннотация и введение

OpenCitations Meta: Özet ve Giriş

OpenCites Meta: Tóm tắt và giới thiệu

OpenCitations Meta：摘要和简介

OpenCitations Meta: Related Works

OpenCitations Meta: সম্পর্কিত কাজ

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