Content Provider
LeibnizOpen (The Leibniz Association)
43
Unknown
6
DataCite Metadata Store (German National Library of Science and Technology)
2
Renate - Repositorium für Naturwissenschaften und Technik (TIB Hannover)
2
Annals of Geophysics (INGV, Istituto Nazionale di Geofisica e Vulcanologia)
1
Digital Collections of Colorado (Colorado State University)
1
Directory of Open Access Journals: DOAJ Articles
1
Mountain Scholar (Digital Collections of Colorado and Wyoming)
1
National Technical University of Athens (NTUA): DSpace
1