Content Provider
DataCite Metadata Store (German National Library of Science and Technology)
27
Norsk Polarinstitutt: Brage NP
14
Norwegian Polar Institute: Brage NP
14
WikiBooks - Open-content textbooks
5
DataCite
2
BORIS (Bern Open Repository and Information System, University of Bern)
1
Bavarian Digital Repository (BDR - Bayerische Staatsbibliothek Munich, BSB)
1
Digital Repository of Scientific Institutes (RCIN)
1
Frankfurt/Main University Library: Digitale Sammlungen
1
IODE-UNESCO: OceanDocs - E-Repository of Ocean Publications
1
OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel)
1
Open-Access-Publikationsserver der Humboldt-Universität: edoc-Server
1
OpenAgrar (OA)
1
Project Gutenberg (PG)
1
Publikationsdatenbank der Fraunhofer-Gesellschaft
1
RWTH Aachen University: RWTH Publications
1
UFZ - Publication Index (Helmholtz-Centre for Environmental Research)
1
Umeå University: Publications (DiVA)
1
University of Groningen research database
1
University of Wisconsin, Milwaukee: UWM Libraries Digital Collections
1
Zenodo
1