Content Provider
LeibnizOpen (The Leibniz Association)
18
Copernicus Publications: E-Journals
2
Unknown
2
DataCite Metadata Store (German National Library of Science and Technology)
1
ETH Zürich Research Collection
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