Content Provider
WikiBooks - Open-content textbooks
43
Unknown
36
Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center)
31
DataCite Metadata Store (German National Library of Science and Technology)
31
Wiley Online Library
30
PubMed Central (PMC)
24
Directory of Open Access Journals: DOAJ Articles
19
Zenodo
16
University of California: eScholarship
9
NORA (National aggregator of open repositories of Russian universities)
7
Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe)
6
DataCite
6
University of Copenhagen: Research
6
University of Southampton: e-Prints Soton
6
Kazan Federal University Digital Repository
5
Lund University Publications (LUP)
5
PANGAEA - Data Publisher for Earth & Environmental Science
5
Université de Nantes: HAL-UNIV-NANTES
5
AAAS Resource Center (American Association for the Advancement of Science)
4
Cambridge University Press
4
Frontiers: Figshare
4
Journals at the University of Arizona
4
Aarhus University: Research
3
Arctic Data Center (via DataONE)
3
Dryad Digital Repository (Duke University)
3
MDPI Open Access Publishing
3
ORA - Oxford University Research Archive
3
OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel)
3
Oxford University Press (via Crossref)
3
The University of Kansas: KU ScholarWorks
3
University of Alaska: ScholarWorks@UA
3
University of Nebraska-Lincoln: DigitalCommons@UNL
3
Université Paris Lumières: HAL
3
Australian National University: ANU Digital Collections
2
CONICET Digital (Consejo Nacional de Investigaciones Científicas y Técnicas)
2
Canadian Science Publishing (via Crossref)
2
CentAUR: Central Archive at the University of Reading
2
Cologne University: KUPS
2
Copernicus Publications: E-Journals
2
Data Archiving and Networked Services (DANS): EASY (KNAW - Koninklijke Nederlandse Akademie van Wetenschappen)
2
EPFL Infoscience (Ecole Polytechnique Fédérale Lausanne)
2
Frontiers (Publisher)
2
Griffith University: Griffith Research Online
2
IRIS Università degli Studi di Bologna (CRIS - Current Research Information System)
2
Institut national des sciences de l'Univers: HAL-INSU
2
King's College, London: Research Portal
2
Max Planck Society: MPG.PuRe
2
OSKAR Bordeaux (Open Science Knowledge ARchive)
2
RePEc (Research Papers in Economics)
2
Royal Holloway University of London: Royal Holloway Digital Repository
2
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