Crossref as a new source of citation data: A comparison with Web of Science and Scopus

« (…) At present, scientometricians typically obtain citation data from Web of Science (WoS) and Scopus, two proprietary data sources. In this post, we provide empirical insights into the value of Crossref as a new source of citation data. We compare Crossref with WoS and Scopus, focusing on the citation data that is available in the different data sources. Our analysis will show that more than three-quarters of the references in WoS and more than two-thirds of the Scopus references can be found in Crossref, with about half of these references being openly available. On the other hand, it will also be shown that millions of references are missing in Crossref. These references occur in publications that have been deposited in Crossref without their references. (…) »