Content Provider
DataCite Metadata Store (German National Library of Science and Technology)
141
Memorial University of Newfoundland: Digital Archives Initiative (DAI)
19
University of Vienna: Phaidra
16
WikiBooks - Open-content textbooks
16
Robert Koch Institute: Publications
15
Bavarian Digital Repository (BDR - Bayerische Staatsbibliothek Munich, BSB)
14
Biodiversity Heritage Library (BHL)
13
DigiZeitschriften: The German digital journal archive (Göttingen University Library)
13
University of Michigan: Digital Collections
12
Hathi Trust Digital Library
9
Springer Nature (via Crossref)
9
Thieme (via Crossref)
6
Georg-August-Universität Göttingen: GOEDOC
5
Universitätsbibliothek Paderborn: Digitale Sammlungen
3
Böhlau Verlag (via Crossref)
2
DIAL@USL-B (Université Saint-Louis, Bruxelles)
2
Digital Repository of Scientific Institutes (RCIN)
2
GAMS - Humanities' Asset Management System (Austrian Centre for Digital Humanities, University of Graz)
2
GMS - German Medical Science
2
LIBDOC - Publikationsserver der Westsächsischen Hochschule Zwickau
2
OpenAgrar (OA)
2
Project Gutenberg (PG)
2
Publication Server of FH Münster - University of Applied Sciences
2
Publication Server of Goethe University Frankfurt am Main
2
TU Braunschweig: LeoPARD - Publications And Research Data
2
University of Freiburg: FreiDok
2
Unknown
2
hogrefe (via Crossref)
2
Aarhus University: Research
1
Augsburg University Publication Server (OPUS)
1
BOKU:ePUB (Publikationsserver der Universitätsbibliothek Bodenkultur Wien)
1
Brigham Young University (BYU): ScholarsArchive
1
Eberhard Karls University Tübingen: Publication System
1
Eldorado - Repositorium der TU Dortmund
1
Journal für Psychoanalyse (Psychoanalytisches Seminar Zürich - PSZ)
1
Max Planck Society: MPG.PuRe
1
Memorial University of Newfoundland: Research Repository
1
PUB - Publications at Bielefeld University
1
Publikationsdatenbank der Fraunhofer-Gesellschaft
1
TU Berlin: Deposit Once
1
ULB Düsseldorf: Digitale Sammlungen (University Library of Düsseldorf University)
1
University of Zurich (UZH): HOPE (Hauptbibliothek Open Publishing Environment)
1
University of Zurich (UZH): ZORA (Zurich Open Repository and Archive
1
da|ra - Registration agency for social and economic data
1
dilibri (Landesbibliothekszentrum Rhineland-Palatinate)
1
ediss.sub.hamburg (Staats- und Universitätsbibliothek Hamburg, Carl von Ossietzky)
1
epub.oeaw (The digital publication portal of the Austrian Academy of Sciences)
1