Content Provider
DataCite Metadata Store (German National Library of Science and Technology)
9
Bavarian Digital Repository (BDR - Bayerische Staatsbibliothek Munich, BSB)
3
Directory of Open Access Journals: DOAJ Articles
3
Freie Universität Berlin: Refubium (FU Berlin)
3
GEO-LEOe-docs (FID GEO)
3
University of Potsdam: publish.UP
3
Gallica - bibliothèque numérique de la Bibliothèque nationale de France (BnF)
2
Georg-August-Universität Göttingen: GOEDOC
2
Publication Server of Goethe University Frankfurt am Main
2
WikiBooks - Open-content textbooks
2
BORIS (Bern Open Repository and Information System, University of Bern)
1
DORA Eawag
1
Dresden University of Technology: Qucosa
1
Frankfurt/Main University Library: Digitale Sammlungen
1
Georg-August-Universität Göttingen: eDiss
1
KITopen (Karlsruhe Institute of Technologie)
1
Leuphana University of Lüneburg: Forschungsindex FOX
1
Max Planck Society: MPG.PuRe
1
OPUS - Publication Server of the University of Stuttgart
1
Publication Server of Leuphana University Lüneburg
1
REPOSIT HAW Hamburg
1
RegionaliaOpen – Open-Access-Publikationsserver für den Südwesten
1
Saxon State Library - State and University Library Dresden (SLUB): Qucosa
1
ScienceDirect (Elsevier - via Crossref)
1
The Library of Congress: American Memory
1
Universitäts- und Landesbibliothek Sachsen-Anhalt: Bibliotheca Ponickaviana
1