Content Provider
Woods Hole Scientific Community: WHOAS (Woods Hole Open Access Server)
21
DataCite Metadata Store (German National Library of Science and Technology)
11
Natural Environment Research Council: NERC Open Research Archive
8
ScienceDirect (Elsevier - via Crossref)
6
The Royal Society
5
University of Groningen research database
5
ScienceDirect (Elsevier)
4
CONICET Digital (Consejo Nacional de Investigaciones Científicas y Técnicas)
3
AAAS Resource Center (American Association for the Advancement of Science)
2
Columbia University: Academic Commons
2
Frontiers (Publisher)
2
Niedersächsisches Online-Archiv NOA
2
Springer Nature (via Crossref)
2
University of East Anglia: UEA Digital Repository
2
Wiley Online Library
2
MACAU: Open Access Repository of Kiel University
1
Montana State University (MSU): ScholarWorks
1
Oxford University Press
1
PLOS
1
University of Bristol: Bristol Research
1
University of the Highlands and Islands: Research Database of UHI
1
White Rose Research Online (Universities of Leeds, Sheffield & York)
1
Wiley Online Library (via Crossref)
1