Content Provider
ScienceDirect (Elsevier)
528
Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences: GIEC OpenIR
481
ACS Publications
436
DataCite Metadata Store (German National Library of Science and Technology)
436
ScienceDirect (Elsevier - via Crossref)
374
Directory of Open Access Journals: DOAJ Articles
343
Unknown
272
SciTec Connect (Office of Scientific and Technical Information - OSTI, U.S. Department of Energy)
210
RePEc (Research Papers in Economics)
179
MDPI Open Access Publishing
151
OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel)
128
Wiley Online Library
127
Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe)
124
Springer Nature (via Crossref)
108
University of North Texas: UNT Digital Library
93
PubMed Central (PMC)
89
Université de Nantes: HAL-UNIV-NANTES
85
AIP Publishing
77
University of California: eScholarship
66
IOP Publishing
65
Informa
50
University of British Columbia: cIRcle - UBC's Information Repository
50
Royal Society of Chemistry
49
Guangzhou Institute of Geochemistry: GIG OpenIR (Chinese Academy of Sciences)
48
University of Southampton: e-Prints Soton
48
ACS Publications (via Crossref)
45
LeibnizOpen (The Leibniz Association)
44
Korea Advanced Institute of Science and Technology: KOASAS - KAIST Open Access Self-Archiving System
40
DataCite
39
National Research Council Canada: NRC Publications Archive
37
ArXiv.org (Cornell University Library)
34
Natural Environment Research Council: NERC Open Research Archive
34
Mines de Saint-Etienne: Open Archive (HAL)
33
Frontiers: Figshare
32
PANGAEA - Data Publisher for Earth & Environmental Science
32
Zenodo
31
GFZpublic (German Research Centre for Geosciences, Helmholtz-Zentrum Potsdam)
29
University College London: UCL Discovery
29
Woods Hole Scientific Community: WHOAS (Woods Hole Open Access Server)
28
Archimer (Archive Institutionnelle de l'Ifremer - Institut français de recherche pour l'exploitation de la mer)
25
Institut national des sciences de l'Univers: HAL-INSU
25
Technical University of Denmark: DTU Orbit
25
IMECH-IR (Institute of Mechanics, Chinese Academy of Sciences)
23
IRIS Università degli Studi di Perugia
22
Data Archiving and Networked Services (DANS): EASY (KNAW - Koninklijke Nederlandse Akademie van Wetenschappen)
21
University of Bergen: Bergen Open Research Archive (BORA-UiB)
21
Defense Technical Information Center: DTIC Technical Reports database
20
NORA (National aggregator of open repositories of Russian universities)
20
Institute of Oceanology, Chinese Academy of Sciences: IOCAS-IR
19
Wiley Online Library (via Crossref)
19
more ...