Content Provider
DataCite Metadata Store (German National Library of Science and Technology)
4,359
ArXiv.org (Cornell University Library)
1,106
Unknown
827
DataCite
808
PANGAEA - Data Publisher for Earth & Environmental Science
753
David Rumsey Historical Map Collection (Cartography Associates)
680
Caltech Authors (California Institute of Technology)
469
SciTec Connect (Office of Scientific and Technical Information - OSTI, U.S. Department of Energy)
385
Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe)
374
Directory of Open Access Journals: DOAJ Articles
372
NASA Technical Reports Server (NTRS)
320
Institut national des sciences de l'Univers: HAL-INSU
305
Zenodo
276
Université de Nantes: HAL-UNIV-NANTES
275
University of California: eScholarship
255
WikiBooks - Open-content textbooks
234
CERN Document Server (CDS)
196
HAL Sorbonne Université
182
Cambridge University Press
145
DESY Publication Database (PUBDB)
140
Cardiff University: ORCA (Online Research @ Cardiff)
135
ScienceDirect (Elsevier - via Crossref)
116
Copernicus Publications: E-Journals
115
DSpace@MIT (Massachusetts Institute of Technology)
115
Université de Paris: Portail HAL
115
German Aerospace Center: elib - DLR electronic library
114
Springer Nature (via Crossref)
110
DI-fusion : dépôt institutionnel de l'Université libre de Bruxelles (ULB)
108
National Library of Australia: Digital Collections
104
KITopen (Karlsruhe Institute of Technologie)
100
Max Planck Society: MPG.PuRe
100
Archive de l'Observatoire de Paris (HAL)
98
University College London: UCL Discovery
97
ORA - Oxford University Research Archive
96
Wiley Online Library
91
Niedersächsisches Online-Archiv NOA
80
HAL-CEA (Commissariat à l'énergie atomique et aux énergies alternatives)
74
AAAS Resource Center (American Association for the Advancement of Science)
73
PubMed Central (PMC)
72
National Institute of Polar Research Repository, Japan
71
University of Washington, Seattle: Digital Collections
71
Natural Environment Research Council: NERC Open Research Archive
70
Université Grenoble Alpes: HAL
70
Archives ouvertes de Paris-Saclay
68
Defense Technical Information Center: DTIC Technical Reports database
67
ScienceDirect (Elsevier)
67
IOP Publishing
66
Padua Research Archive (IRIS - Università degli Studi di Padova)
64
Research Data Australia (Australian National Data Service - ANDS)
60
Ghent University Academic Bibliography
59
more ...