Content Provider
DataCite Metadata Store (German National Library of Science and Technology)
968
PANGAEA - Data Publisher for Earth & Environmental Science
425
Directory of Open Access Journals: DOAJ Articles
134
Unknown
85
PubMed Central (PMC)
79
Springer Nature (via Crossref)
76
CONICET Digital (Consejo Nacional de Investigaciones Científicas y Técnicas)
63
Cambridge University Press
51
ScienceDirect (Elsevier - via Crossref)
45
Wiley Online Library (via Crossref)
41
OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel)
39
Wiley Online Library
38
Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe)
33
MDPI Open Access Publishing
31
Natural Environment Research Council: NERC Open Research Archive
30
Magnolia press
28
National Institute of Polar Research Repository, Japan
25
Université de Nantes: HAL-UNIV-NANTES
24
eCite UTAS (University of Tasmania)
22
LeibnizOpen (The Leibniz Association)
21
ScienceDirect (Elsevier)
20
HighWire Press (Stanford University)
18
Digital.CSIC (Spanish National Research Council)
17
Informa (via Crossref)
16
University of Tasmania: UTas ePrints
13
Archivio della ricerca dell'Università di Modena e Reggio Emilia (Unimore: IRIS)
12
BioOne Online Journals
12
HAL - Université de La Rochelle
12
Oxford University Press (via Crossref)
12
German Aerospace Center: elib - DLR electronic library
11
Institut national des sciences de l'Univers: HAL-INSU
11
Murdoch University: Murdoch Research Repository
10
Scientia Marina (E-Journal)
10
University of Southampton: e-Prints Soton
10
Canadian Science Publishing (via Crossref)
9
The University of Queensland: UQ eSpace
9
The Royal Society (via Crossref)
8
Macquarie University Research Portal
7
Stellenbosch University: SUNScholar Research Repository
7
Universidad Nacional de La Plata (UNLP): SeDiCI (Servicio de Difusión de la Creación Intelectual)
7
University of Groningen research database
7
Università degli studi della Tuscia: Unitus DSpace
7
Flanders Marine Institute (VLIZ): Open Marine Archive (OMA)
6
HAL Sorbonne Université
6
NOVA: The University of Newcastle Research Online (Australia)
6
Oxford University Press
6
Pensoft Publishers
6
The University of Adelaide: Digital Library
6
Universidad de Chile: Repositorio académico
6
University of St Andrews: Research Portal
6
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