Content Provider
DataCite Metadata Store (German National Library of Science and Technology)
81
Directory of Open Access Journals: DOAJ Articles
17
University of Alaska: ScholarWorks@UA
11
Unknown
6
University of Calgary Journal Hosting
5
Wiley Online Library
5
Copernicus Publications: E-Journals
3
DataCite
3
Jultika - University of Oulu repository
3
MDPI Open Access Publishing
3
Northumbria University, Newcastle: Northumbria Research Link (NRL)
3
BioMed Central
2
Canadian Science Publishing
2
DSpace@MIT (Massachusetts Institute of Technology)
2
OpenAgrar (OA)
2
Washington State University: WSU Libraries Digital Collections
2
Aarhus University: Research
1
Cambridge University Press
1
Florida Online Journals (FloridaOJ)
1
Hathi Trust Digital Library
1
HighWire Press (Stanford University)
1
Max Planck Society: MPG.PuRe
1
Munich Personal RePEc Archive (MPRA - Ludwig-Maximilians-University Munich)
1
Niedersächsisches Online-Archiv NOA
1
Oxford University Press (via Crossref)
1
PubMed Central (PMC)
1
SAGE Publications (via Crossref)
1
ScienceDirect (Elsevier - via Crossref)
1
Swedish University of Agricultural Sciences (SLU): Epsilon Open Archive
1
University of Michigan: Digital Collections
1
University of Wisconsin: Digital Collections
1
Woods Hole Scientific Community: WHOAS (Woods Hole Open Access Server)
1
Érudit.org (Université Montréal)
1