Content Provider
LeibnizOpen (The Leibniz Association)
21
Unknown
2
DataCite Metadata Store (German National Library of Science and Technology)
1
NORA (National aggregator of open repositories of Russian universities)
1
Peoples' Friendship University of Russia (RUDN): Open repository
1
Renate - Repositorium für Naturwissenschaften und Technik (TIB Hannover)
1