Content Provider
PANGAEA - Data Publisher for Earth & Environmental Science
8,727
DataCite Metadata Store (German National Library of Science and Technology)
598
Directory of Open Access Journals: DOAJ Articles
223
Unknown
177
Defense Technical Information Center: DTIC Technical Reports database
155
CONICET Digital (Consejo Nacional de Investigaciones Científicas y Técnicas)
123
ScienceDirect (Elsevier - via Crossref)
121
Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe)
104
ScienceDirect (Elsevier)
86
OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel)
77
PubMed Central (PMC)
67
Springer Nature (via Crossref)
66
Université de Nantes: HAL-UNIV-NANTES
66
Wiley Online Library
66
Institut national des sciences de l'Univers: HAL-INSU
63
Magnolia press
63
Wiley Online Library (via Crossref)
57
Copernicus Publications: E-Journals
50
Archimer (Archive Institutionnelle de l'Ifremer - Institut français de recherche pour l'exploitation de la mer)
47
Cambridge University Press
46
Universidade Estadual Paulista São Paulo: Repositório Institucional UNESP
46
Digital.CSIC (Spanish National Research Council)
41
Natural Environment Research Council: NERC Open Research Archive
35
Niedersächsisches Online-Archiv NOA
34
HAL Sorbonne Université
30
USP Production Repository (Universidade de São Paulo)
29
Biodiversity Heritage Library (BHL)
28
University of Southampton: e-Prints Soton
28
University of Cape Town: OpenUCT
26
Phaidra Digital Collections (Permanent Hosting, Archiving and Indexing of Digital Resources and Assets - Università degli Studi di Padova)
25
SciELO Brazil (Scientific Electronic Library Online)
24
Informa (via Crossref)
23
MDPI Open Access Publishing
22
Oxford University Press
20
Université de Versailles Saint-Quentin-en-Yvelines: HAL-UVSQ
20
HAL-CEA (Commissariat à l'énergie atomique et aux énergies alternatives)
19
University of Pretoria: UPSpace
18
HighWire Press (Stanford University)
17
Universidade Estadual Paulista São Paulo: Acervo Digital da UNESP / São Paulo State University
17
Université de Bretagne Occidentale: HAL
17
Université de Paris: Portail HAL
17
Zenodo
17
Universidade de São Paulo: Portal de Revistas da USP
16
University of São Paulo: Digital Library of Theses and Dissertations
16
Utrecht University Repository
16
IRD (Institute de recherche pour le développement): Horizon
14
RI FURG (Repositório da Universidade Federal do Rio Grande)
14
Rhodes University Cory: Repository
14
SEALS Digital Commons (South East Academic Libraries System, South Africa)
14
University of Luxembourg: ORBilu - Open Repository and Bibliography
14
more ...