Content Provider
DataCite Metadata Store (German National Library of Science and Technology)
2
Dryad Digital Repository (Duke University)
2
Data Archiving and Networked Services (DANS): EASY (KNAW - Koninklijke Nederlandse Akademie van Wetenschappen)
1
ScienceDirect (Elsevier - via Crossref)
1
University of Groningen research database
1
Unknown
1