Content Provider
Directory of Open Access Journals: DOAJ Articles
5,024
ScienceDirect (Elsevier - via Crossref)
3,186
Frontiers: Figshare
3,163
ScienceDirect (Elsevier)
2,774
Defense Technical Information Center: DTIC Technical Reports database
1,829
DataCite Metadata Store (German National Library of Science and Technology)
1,452
Springer Nature (via Crossref)
1,224
Frontiers (Publisher)
1,210
Unknown
1,073
Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe)
1,010
Luleå University of Technology Publications (DiVA)
954
Memorial University of Newfoundland: Digital Archives Initiative (DAI)
798
Université de Nantes: HAL-UNIV-NANTES
685
Cambridge University Press
423
IEEE Publications (via Crossref)
407
University of California: eScholarship
400
Canadian Science Publishing (via Crossref)
296
Wiley Online Library (via Crossref)
296
IEEE Publications
293
Informa (via Crossref)
291
eCite UTAS (University of Tasmania)
274
Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences: GIEC OpenIR
244
Research Data Australia (Australian National Data Service - ANDS)
240
Université Grenoble Alpes: HAL
236
Theseus.fi (Open Repository of the Universities of Applied Sciences)
231
Croatian Digital Theses Repository (National and University Library in Zagreb)
219
Institut national des sciences de l'Univers: HAL-INSU
213
Skemman (Iceland)
211
LeibnizOpen (The Leibniz Association)
193
Chalmers University of Technology: Chalmers research
192
University of Strathclyde Glasgow: Strathprints
172
ACS Publications
169
SAGE Publications (via Crossref)
157
DSpace@MIT (Massachusetts Institute of Technology)
154
JSTOR (via Crossref)
152
Royal Institute of Technology, Stockholm: KTHs Publication Database DiVA
146
ArXiv.org (Cornell University Library)
130
Wiley Online Library
124
SciTec Connect (Office of Scientific and Technical Information - OSTI, U.S. Department of Energy)
113
University of California Press (via Crossref)
108
ACS Publications (via Crossref)
107
University of Tromsø: Munin Open Research Archive
107
Université Savoie Mont Blanc: HAL
107
Michigan Technological University: Digital Commons @ Michigan Tech
106
Lund University Publications (LUP)
104
DR-NTU (Digital Repository at Nanyang Technological University, Singapore)
103
University of North Texas: UNT Digital Library
103
USGS Science Data Catalog (via DataONE)
100
Canadian Science Publishing
97
The BMJ
95
more ...