Content Provider
DataCite Metadata Store (German National Library of Science and Technology)
54
ArXiv.org (Cornell University Library)
37
SciTec Connect (Office of Scientific and Technical Information - OSTI, U.S. Department of Energy)
35
University College London: UCL Discovery
7
Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe)
5
CERN Document Server (CDS)
4
Université de Nantes: HAL-UNIV-NANTES
4
Imperial College London: Spiral
3
Embry-Riddle Aeronautical University: ERAU Scholarly Commons
2
Institut national des sciences de l'Univers: HAL-INSU
2
Apollo - University of Cambridge Repository
1
Archives ouvertes de Paris-Saclay
1
Directory of Open Access Journals: DOAJ Articles
1
Estonian University of Life Sciences: DSpace
1
HAL-IN2P3 (Institut national de physique nucléaire et de physique des particules)
1
HELDA – University of Helsinki Open Repository
1
Informa (via Crossref)
1
Institute of Theoretical Physics: ITP OpenIR (Chinese Academy of Sciences)
1
Merrimack College: Merrimack ScholarWorks
1
Missouri University of Science and Technology (Missouri S&T): Scholars' Mine
1
Ohio State University (OSU): Knowledge Bank
1
PANGAEA - Data Publisher for Earth & Environmental Science
1
The University of Manchester: Research Explorer
1
University of Canterbury, Christchurch: UC Research Repository
1
University of North Texas: UNT Digital Library
1
University of San Francisco (USF): Scholarship Repository
1
Università degli studi di Trieste: ArTS (Archivio della ricerca di Trieste)
1
Université de Paris: Portail HAL
1
Unknown
1
VTechWorks (VirginiaTech)
1
bonndoc - The Repository of the University of Bonn
1