Content Provider
DataCite Metadata Store (German National Library of Science and Technology)
1
Directory of Open Access Journals: DOAJ Articles
1
Georg-August-Universität Göttingen: GOEDOC
1
German Aerospace Center: elib - DLR electronic library
1
Media SuUB Bremen (Staats- und Universitätsbibliothek Bremen)
1
OpenAgrar (OA)
1