Content Provider
DataCite Metadata Store (German National Library of Science and Technology)
111
PANGAEA - Data Publisher for Earth & Environmental Science
109
LeibnizOpen (The Leibniz Association)
38
Unknown
6
Copernicus Publications: E-Journals
3
Niedersächsisches Online-Archiv NOA
2
Cologne University: KUPS
1
Renate - Repositorium für Naturwissenschaften und Technik (TIB Hannover)
1