Content Provider
Copernicus Publications: E-Journals
13
DataCite Metadata Store (German National Library of Science and Technology)
13
Springer Nature (via Crossref)
7
Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center)
6
Niedersächsisches Online-Archiv NOA
6
Peking University Institutional Repository (PKU IR)
5
PubMed Central (PMC)
5
ScienceDirect (Elsevier)
4
NASA Technical Reports Server (NTRS)
3
OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel)
3
ScienceDirect (Elsevier - via Crossref)
3
Wiley Online Library
3
Cambridge University Press
2
PANGAEA - Data Publisher for Earth & Environmental Science
2
Frontiers (Publisher)
1
IOP Publishing
1
MACAU: Open Access Repository of Kiel University
1
National Space Science Center: NSSC OpenIR (Chinese Academy of Sciences)
1
Natural Environment Research Council: NERC Open Research Archive
1
SciTec Connect (Office of Scientific and Technical Information - OSTI, U.S. Department of Energy)
1
University of California: eScholarship
1
Zenodo
1