Content Provider
DataCite Metadata Store (German National Library of Science and Technology)
189
LeibnizOpen (The Leibniz Association)
43
WikiBooks - Open-content textbooks
39
Unknown
33
OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel)
31
University of Freiburg: FreiDok
25
DataCite
23
Max Planck Society: MPG.PuRe
18
EconStor (German National Library of Economics, ZBW)
17
Springer Nature (via Crossref)
14
University of Potsdam: publish.UP
12
Wiley Online Library
11
Zenodo
11
Bavarian Digital Repository (BDR - Bayerische Staatsbibliothek Munich, BSB)
10
Georg-August-Universität Göttingen: GOEDOC
9
KITopen (Karlsruhe Institute of Technologie)
9
DigiZeitschriften: The German digital journal archive (Göttingen University Library)
8
Directory of Open Access Journals: DOAJ Articles
8
Publication Server of Goethe University Frankfurt am Main
8
Publication Server of the Justus-Liebig-University of Giessen
8
da|ra - Registration agency for social and economic data
8
GFZpublic (German Research Centre for Geosciences, Helmholtz-Zentrum Potsdam)
7
BORIS (Bern Open Repository and Information System, University of Bern)
5
GEO-LEOe-docs (FID GEO)
5
Media SuUB Bremen (Staats- und Universitätsbibliothek Bremen)
5
PUB - Publications at Bielefeld University
5
Publication Database IASS (Institute for Advanced Sustainability Studies Potsdam)
5
University of Groningen research database
5
University of Michigan: Digital Collections
5
Wissenschaftliche Verlagsgesellschaft Stuttgart
5
e-rara.ch (ETH Zürich)
5
ediss.sub.hamburg (Staats- und Universitätsbibliothek Hamburg, Carl von Ossietzky)
5
DIAL@USL-B (Université Saint-Louis, Bruxelles)
4
Justus-Liebig-Universität Giessen: JLUpub
4
Universität der Bundeswehr München: AtheneForschung
4
Directory of Open Access Books (DOAB)
3
ETH Zürich Research Collection
3
Frankfurt/Main University Library: Digitale Sammlungen
3
Georg-August-Universität Göttingen: eDiss
3
Heidelberg University: HeiDok
3
LaCRIS - University of Lapland Current Research System
3
Publication Server of the FH Aachen University of Applied Sciences
3
RWTH Aachen University: RWTH Publications
3
ULB Düsseldorf: Digitale Sammlungen (University Library of Düsseldorf University)
3
University of Vienna: Phaidra
3
Universität Leipzig: Qucosa
3
Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe)
2
Biodiversity Heritage Library (BHL)
2
Digital Repository of Scientific Institutes (RCIN)
2
Dresden University of Technology: Qucosa
2
more ...