Content Provider
LeibnizOpen (The Leibniz Association)
22
Digital Commons University of South Florida (USF)
3
University of South Florida St. Petersburg: Digital USFSP
3
Unknown
3
Apollo - University of Cambridge Repository
2
DataCite
2
DataCite Metadata Store (German National Library of Science and Technology)
2
Directory of Open Access Journals: DOAJ Articles
2
Durham University: Durham Research Online
1
Renate - Repositorium für Naturwissenschaften und Technik (TIB Hannover)
1
The University of Adelaide: Digital Library
1
University of California: eScholarship
1
University of Exeter: Open Research Exeter (ORE)
1