Content Provider
Unknown
5
DataverseNO
4
DataCite Metadata Store (German National Library of Science and Technology)
2
HighWire Press (Stanford University)
2
University of Tromsø: Munin Open Research Archive
2
Wiley Online Library
2
Oxford University Press
1
PubMed Central (PMC)
1
Wiley Online Library (via Crossref)
1
Zenodo
1