Content Provider
DataCite Metadata Store (German National Library of Science and Technology)
154
LeibnizOpen (The Leibniz Association)
61
Directory of Open Access Journals: DOAJ Articles
51
PANGAEA - Data Publisher for Earth & Environmental Science
47
Unknown
47
Copernicus Publications: E-Journals
39
University of California: eScholarship
36
Natural Environment Research Council: NERC Open Research Archive
33
Zenodo
24
Niedersächsisches Online-Archiv NOA
23
Cambridge University Press
15
Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center)
14
University of St Andrews: Digital Research Repository
14
PubMed Central (PMC)
13
SciTec Connect (Office of Scientific and Technical Information - OSTI, U.S. Department of Energy)
11
Imperial College London: Spiral
9
Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe)
8
IEDA: US Antarctic Program Data Center (via DataONE)
8
Institut national des sciences de l'Univers: HAL-INSU
8
University of St Andrews: Research Portal
8
Apollo - University of Cambridge Repository
7
MDPI Open Access Publishing
7
The University of Texas at Austin: Texas ScholarWorks
7
University College London: UCL Discovery
7
DI-fusion : dépôt institutionnel de l'Université libre de Bruxelles (ULB)
6
German Aerospace Center: elib - DLR electronic library
6
University of Bristol: Bristol Research
6
Université de Nantes: HAL-UNIV-NANTES
6
eCite UTAS (University of Tasmania)
6
AAAS Resource Center (American Association for the Advancement of Science)
5
Flanders Marine Institute (VLIZ): Open Marine Archive (OMA)
5
NASA Technical Reports Server (NTRS)
5
Université Grenoble Alpes: HAL
5
Utrecht University Repository
5
Central Washington University: ScholarWorks
4
Digital Commons University of South Florida (USF)
4
GFZpublic (German Research Centre for Geosciences, Helmholtz-Zentrum Potsdam)
4
JPL Technical Report Server
4
Northumbria University, Newcastle: Northumbria Research Link (NRL)
4
Renate - Repositorium für Naturwissenschaften und Technik (TIB Hannover)
4
Rice University: Digital Scholarship Archive
4
University of South Florida St. Petersburg: Digital USFSP
4
White Rose Research Online (Universities of Leeds, Sheffield & York)
4
Durham University: Durham Research Online
3
LaCRIS - University of Lapland Current Research System
3
ScienceDirect (Elsevier)
3
The University of Kansas: KU ScholarWorks
3
University of East Anglia: UEA Digital Repository
3
University of Washington, Seattle: ResearchWorks
3
AIP Publishing
2
more ...