Content Provider
PANGAEA - Data Publisher for Earth & Environmental Science
8,511
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
ScienceDirect (Elsevier - via Crossref)
152
CONICET Digital (Consejo Nacional de Investigaciones Científicas y Técnicas)
123
Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe)
104
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
Institut national des sciences de l'Univers: HAL-INSU
63
Magnolia press
63
Wiley Online Library (via Crossref)
61
Wiley Online Library
58
ScienceDirect (Elsevier)
51
Copernicus Publications: E-Journals
50
Archimer (Archive Institutionnelle de l'Ifremer - Institut français de recherche pour l'exploitation de la mer)
46
Universidade Estadual Paulista São Paulo: Repositório Institucional UNESP
46
Cambridge University Press
45
Digital.CSIC (Spanish National Research Council)
40
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
Informa (via Crossref)
26
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
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
HighWire Press (Stanford University)
17
Universidade Estadual Paulista São Paulo: Acervo Digital da UNESP / São Paulo State University
17
University of Pretoria: UPSpace
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 ...