Content Provider
DataCite Metadata Store (German National Library of Science and Technology)
2
Dryad Digital Repository (Duke University)
2
AJOL - African Journals Online
1
Canadian Science Publishing (via Crossref)
1
Data Archiving and Networked Services (DANS): EASY (KNAW - Koninklijke Nederlandse Akademie van Wetenschappen)
1
University of California: eScholarship
1
Unknown
1
Zenodo
1