Content Provider
Directory of Open Access Journals: DOAJ Articles
5
Niedersächsisches Online-Archiv NOA
5
Unknown
4
DataCite Metadata Store (German National Library of Science and Technology)
3
Northumbria University, Newcastle: Northumbria Research Link (NRL)
3
Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center)
1
Natural Environment Research Council: NERC Open Research Archive
1