Content Provider
LeibnizOpen (The Leibniz Association)
21
Unknown
4
University of California: eScholarship
2
AAAS Resource Center (American Association for the Advancement of Science)
1
Cambridge University Press
1
Directory of Open Access Journals: DOAJ Articles
1
Durham University: Durham Research Online
1
Imperial College London: Spiral
1
LaCRIS - University of Lapland Current Research System
1
Natural Environment Research Council: NERC Open Research Archive
1
Niedersächsisches Online-Archiv NOA
1
Northumbria University, Newcastle: Northumbria Research Link (NRL)
1
Publication Database PIK (Potsdam Institute for Climate Impact Research)
1
University College London: UCL Discovery
1
Wageningen UR (University & Research Centre): Digital Library
1