Publisher linking services provider CrossRef, US, has announced that it has recently registered its 30 millionth DOI. While the majority of CrossRef's Digital Object Identifiers (DOIs) are assigned to online journal articles, there are now over 2.5 million DOI names assigned to other types of publications, including conference proceedings, dissertations, books, datasets, and technical reports. CrossRef's dues-paying membership exceeds 500, with over 2,400 publishers and societies participating in CrossRef linking.
The 30 millionth DOI, doi:10.1103/PhysRevE.76.055201, was registered by The American Physical Society for their journal Physical Review E. CrossRef adds an average of 550,000 new items every month to its DOI registry and linking service. Of the over 6.5 million DOIs created and assigned during the past year, a large number are associated with archival, or back-file, journal articles, as several large publishers have recently undertaken extensive retro-digitisation projects. This includes the Royal Society, Elsevier, Springer, Sage, Kluwer, Wiley, Blackwell, and the American Association for the Advancement of Science.
CrossRef is an independent membership association founded and directed by publishers. It seeks to improve access to published scholarship through collaborative technologies. The Company operates a cross-publisher citation linking system, and is the official DOI registration agency for scholarly and professional content.
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