More than 624 million citations now available on COCI | OpenCitations

"COCI is our first OpenCitations Index of open citations, in which we have applied the concept of citations as first-class data entities, each identified using a unique persistent Open Citation Identifier (OCI), to index the contents of one of the major databases of open scholarly citation information, namely Crossref, and to render and make available this information in machine-readable RDF. We are now proud to announce the third release of COCI, which contains more than 624 million DOI-to-DOI citation links coming from both ‘the ‘Open’ and the ‘Limited’ sets of Crossref reference data. This represents an increase of 40% in the number of indexed citations, compared with the second release of COCI on 12th November 2018, which indexed more than 445 million citations. The data model used for this third release of COCI is the updated revision of the OpenCitation Data Model, published on 8 November 2019 and available at https://doi.org/10.6084/m9.figshare.3443876. This new release of COCI has been created using new software developed specifically for this purpose, which is available on our GitHub repository under an open ISC license. This software automates the process of creating an OpenCitations Index compliant with the OpenCitations Data Model and creates the citation data and related provenance information in three different formats: CSV, N-Triples (RDF), and Scholix. The support for Scholix – a high-level interoperability framework supported by Crossref, DataCite, Europe PubMed Central, OpenAIRE and others  – has recently been added to provide an additional format for the exchange of information about the links between scholarly literature and datasets...."