Content Provider
Arctic Data Center (via DataONE)
45
Technical University of Denmark: DTU Orbit
14
DataCite Metadata Store (German National Library of Science and Technology)
8
Directory of Open Access Journals: DOAJ Articles
6
Aarhus University: Research
4
Springer Nature (via Crossref)
3
University of Copenhagen: Research
3
Unknown
3
BioMed Central
2
HighWire Press (Stanford University)
1
PubMed Central (PMC)
1
University of Nebraska Omaha: DigitalCommons@UNO
1
University of New Hampshire: Scholars Repository
1
University of Tromsø: Septentrio Academic Publishing
1
Wiley Online Library
1
Wiley Online Library (via Crossref)
1