Content Provider
DataCite Metadata Store (German National Library of Science and Technology)
4,581
Arctic Data Center (via DataONE)
61
Directory of Open Access Journals: DOAJ Articles
51
DataCite
31
Unknown
25
Zenodo
23
Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center)
19
Wiley Online Library
19
PANGAEA - Data Publisher for Earth & Environmental Science
16
CyberLeninka (Scientific Electronic Library)
15
MDPI Open Access Publishing
15
Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe)
14
PubMed Central (PMC)
10
Tomsk State University Research Library
10
Université de Nantes: HAL-UNIV-NANTES
9
Aix-Marseille Université: HAL
7
Max Planck Society: MPG.PuRe
7
Copernicus Publications: E-Journals
6
Altai State University: Scientific Journals of ASU
5
NORA (National aggregator of open repositories of Russian universities)
5
Niedersächsisches Online-Archiv NOA
5
University of Michigan: Digital Collections
5
Ural Federal University (URFU): ELAR
5
Archaeology, Ethnology & Anthropology of Eurasia
4
HAL Université Côte d'Azur
4
IOP Publishing
4
Institut national des sciences de l'Univers: HAL-INSU
4
OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel)
4
Oxford University Press (via Crossref)
4
Portail HAL-ANR (Agence Nationale de la Recherche)
4
Université d'Avignon et des Pays de Vaucluse: HAL
4
Archives ouvertes de Paris-Saclay
3
Defense Technical Information Center: DTIC Technical Reports database
3
Lund University Publications (LUP)
3
Magnolia press
3
Pensoft Publishers
3
RePEc (Research Papers in Economics)
3
Saint Petersburg State University: Research Repository (DSpace SPbU)
3
Tomsk Polytechnic University (TPU): Electronic Archive
3
Cambridge University Press
2
Canadian Science Publishing
2
Frontiers (Publisher)
2
HAL-CEA (Commissariat à l'énergie atomique et aux énergies alternatives)
2
HELDA – University of Helsinki Open Repository
2
Hokkaido University Collection of Scholarly and Academic Papers (HUSCAP)
2
IRIS Università degli Studi di Bologna (CRIS - Current Research Information System)
2
Informa (via Crossref)
2
Institut national de la recherche scientifique, Québec: Espace INRS
2
Météo-France: HAL
2
Oxford University Press
2
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