Content Provider
Directory of Open Access Journals: DOAJ Articles
33
Wiley Online Library
23
LeibnizOpen (The Leibniz Association)
20
Unknown
19
DataCite Metadata Store (German National Library of Science and Technology)
13
RePEc (Research Papers in Economics)
13
Wiley Online Library (via Crossref)
13
Cambridge University Press
11
Niedersächsisches Online-Archiv NOA
11
Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center)
8
University of California: eScholarship
7
University of Sussex: Figshare
6
Aarhus University: Research
5
Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe)
5
De Gruyter (via Crossref)
5
Durham University: Durham Research Online
5
Ghent University Academic Bibliography
4
Institut national des sciences de l'Univers: HAL-INSU
4
Lund University Publications (LUP)
4
OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel)
4
Technical University of Denmark: DTU Orbit
4
University of St Andrews: Digital Research Repository
4
University of St Andrews: Research Portal
4
University of Sussex: Sussex Research Online
4
Université de Nantes: HAL-UNIV-NANTES
4
Vrije Universiteit Amsterdam (VU): Research Portal
4
Archimer (Archive Institutionnelle de l'Ifremer - Institut français de recherche pour l'exploitation de la mer)
3
Archives ouvertes de Paris-Saclay
3
Canadian Science Publishing (via Crossref)
3
HAL-CEA (Commissariat à l'énergie atomique et aux énergies alternatives)
3
Max Planck Society: MPG.PuRe
3
Memorial University of Newfoundland: Research Repository
3
Natural Environment Research Council: NERC Open Research Archive
3
Polar Research (E-Journal)
3
University of Glasgow: Enlighten - Publications
3
University of Tromsø: Munin Open Research Archive
3
Université de Versailles Saint-Quentin-en-Yvelines: HAL-UVSQ
3
Utrecht University Repository
3
White Rose Research Online (Universities of Leeds, Sheffield & York)
3
Akademicka Platforma Czasopism
2
Akademicka Platforma Czasopism (APCZ)
2
BORIS (Bern Open Repository and Information System, University of Bern)
2
EPHE (Ecole pratique des hautes études, Paris): HAL
2
Earth-Prints (Istituto Nazionale di Geofisica e Vulcanologia)
2
INRAP: HAL (Institut national de recherches archéologiques préventives)
2
Kazan Federal University Digital Repository
2
LaCRIS - University of Lapland Current Research System
2
NORA (National aggregator of open repositories of Russian universities)
2
National Research Council Canada: NRC Publications Archive
2
OpenSky (NCAR/UCAR - National Center for Atmospheric Research/University Corporation for Atmospheric Research)
2
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