Content Provider
LeibnizOpen (The Leibniz Association)
18
DataCite Metadata Store (German National Library of Science and Technology)
3
Unknown
3
Copernicus Publications: E-Journals
2
Niedersächsisches Online-Archiv NOA
2
Directory of Open Access Journals: DOAJ Articles
1
ETH ZĂĽrich Research Collection
1
Natural Environment Research Council: NERC Open Research Archive
1
OpenSky (NCAR/UCAR - National Center for Atmospheric Research/University Corporation for Atmospheric Research)
1
SciTec Connect (Office of Scientific and Technical Information - OSTI, U.S. Department of Energy)
1
University of California: eScholarship
1