Content Provider
LeibnizOpen (The Leibniz Association)
18
Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center)
7
PANGAEA - Data Publisher for Earth & Environmental Science
7
Unknown
3
DataCite Metadata Store (German National Library of Science and Technology)
2
Directory of Open Access Journals: DOAJ Articles
2
Copernicus Publications: E-Journals
1
ETH Zürich Research Collection
1
MDPI Open Access Publishing
1
Niedersächsisches Online-Archiv NOA
1
Renate - Repositorium für Naturwissenschaften und Technik (TIB Hannover)
1
SciTec Connect (Office of Scientific and Technical Information - OSTI, U.S. Department of Energy)
1
University of California: eScholarship
1