Content Provider
DataCite Metadata Store (German National Library of Science and Technology)
1,109
Unknown
721
PANGAEA - Data Publisher for Earth & Environmental Science
693
Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe)
323
Directory of Open Access Journals: DOAJ Articles
311
Université de Nantes: HAL-UNIV-NANTES
264
CERN Document Server (CDS)
194
Caltech Authors (California Institute of Technology)
189
Institut national des sciences de l'Univers: HAL-INSU
187
DESY Publication Database (PUBDB)
138
ScienceDirect (Elsevier - via Crossref)
132
WikiBooks - Open-content textbooks
123
Cambridge University Press
115
Copernicus Publications: E-Journals
106
DSpace@MIT (Massachusetts Institute of Technology)
99
DI-fusion : dépôt institutionnel de l'Université libre de Bruxelles (ULB)
94
KITopen (Karlsruhe Institute of Technologie)
84
University of California: eScholarship
81
Springer Nature (via Crossref)
79
Niedersächsisches Online-Archiv NOA
78
Defense Technical Information Center: DTIC Technical Reports database
67
PubMed Central (PMC)
63
HAL Sorbonne Université
61
Max Planck Society: MPG.PuRe
60
HighWire Press (Stanford University)
59
ORA - Oxford University Research Archive
59
Cambridge University Press (via Crossref)
57
Università degli studi di Trieste: ArTS (Archivio della ricerca di Trieste)
55
University College London: UCL Discovery
53
National Institute of Polar Research Repository, Japan
52
OpenSky (NCAR/UCAR - National Center for Atmospheric Research/University Corporation for Atmospheric Research)
50
Ghent University Academic Bibliography
49
ScienceDirect (Elsevier)
48
Cardiff University: ORCA (Online Research @ Cardiff)
47
Padua Research Archive (IRIS - Università degli Studi di Padova)
47
Université Grenoble Alpes: HAL
47
The University of Arizona: UA Campus Repository
43
University of North Texas: UNT Digital Library
43
The University of Melbourne: Digital Repository
42
University of Canterbury, Christchurch: UC Research Repository
41
Archive de l'Observatoire de Paris (HAL)
40
Uppsala University: Publications (DiVA)
40
Ohio State University (OSU): Knowledge Bank
39
USRA Houston Repository (Universities Space Research Association)
39
Université de Paris: Portail HAL
38
Wiley Online Library (via Crossref)
38
LeibnizOpen (The Leibniz Association)
37
Zenodo
36
JPL Technical Report Server
35
Harvard University: DASH - Digital Access to Scholarship at Harvard
34
more ...