Content Provider
Directory of Open Access Journals: DOAJ Articles
4
Cambridge University Press
3
Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center)
2
DataCite
2
IOP Publishing
2
Peoples' Friendship University of Russia (RUDN): Open repository
2
University of Tartu: ojs.utlib.ee
2
Apollo - University of Cambridge Repository
1
DataCite Metadata Store (German National Library of Science and Technology)
1
LaCRIS - University of Lapland Current Research System
1
NORA (National aggregator of open repositories of Russian universities)
1
PeerJ Publishing
1
Saint Petersburg State University: Research Repository (DSpace SPbU)
1
Springer Nature (via Crossref)
1
Tomsk State University Research Library
1
University College London: UCL Discovery
1
University of Tromsø: Munin Open Research Archive
1
Wageningen UR (University & Research Centre): Digital Library
1