Content Provider
PANGAEA - Data Publisher for Earth & Environmental Science
26,104
DataCite Metadata Store (German National Library of Science and Technology)
8,407
LeibnizOpen (The Leibniz Association)
20
Unknown
3
OPARU (OPen Access Repository of Ulm University)
2
Defense Technical Information Center: DTIC Technical Reports database
1
Pensoft Publishers
1
Renate - Repositorium für Naturwissenschaften und Technik (TIB Hannover)
1
Zenodo
1