Content Provider
DataCite Metadata Store (German National Library of Science and Technology)
24
WikiBooks - Open-content textbooks
16
DIAL@USL-B (Université Saint-Louis, Bruxelles)
2
Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe)
1
Bavarian Digital Repository (BDR - Bayerische Staatsbibliothek Munich, BSB)
1
Eberhard Karls University Tübingen: Publication System
1
German Aerospace Center: elib - DLR electronic library
1
Keio University: KOARA - KeiO Academic Resource Archiv
1
RegionaliaOpen – Open-Access-Publikationsserver für den Südwesten
1
Thieme (via Crossref)
1
University of Tromsø: Septentrio Academic Publishing
1
Unknown
1
ePLUS - Open Access Publikationsserver der Universität Salzburg
1