Content Provider
PANGAEA - Data Publisher for Earth & Environmental Science
8,495
DataCite Metadata Store (German National Library of Science and Technology)
593
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)
76
Wiley Online Library (via Crossref)
68
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
55
ScienceDirect (Elsevier)
51
Copernicus Publications: E-Journals
50
Wiley Online Library
48
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
44
Digital.CSIC (Spanish National Research Council)
39
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
Informa (via Crossref)
28
University of Southampton: e-Prints Soton
27
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
Université de Versailles Saint-Quentin-en-Yvelines: HAL-UVSQ
20
HAL-CEA (Commissariat à l'énergie atomique et aux énergies alternatives)
19
Oxford University Press
18
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
Zenodo
17
University of São Paulo: Digital Library of Theses and Dissertations
16
Université de Paris: Portail HAL
16
Utrecht University Repository
16
Universidade de São Paulo: Portal de Revistas da USP
15
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 ...