Content Provider
DataCite Metadata Store (German National Library of Science and Technology)
68
ArXiv.org (Cornell University Library)
43
EPFL Infoscience (Ecole Polytechnique Fédérale Lausanne)
22
Curtin University: espace
18
KITopen (Karlsruhe Institute of Technologie)
17
Ghent University Academic Bibliography
16
DESY Publication Database (PUBDB)
14
SciTec Connect (Office of Scientific and Technical Information - OSTI, U.S. Department of Energy)
14
The University of Adelaide: Digital Library
12
Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe)
6
Unknown
6
Université de Nantes: HAL-UNIV-NANTES
5
Loyola University Chicago: Loyola eCommons
4
Uppsala University: Publications (DiVA)
4
OPUS FAU - Online publication system of Friedrich-Alexander-Universität Erlangen-Nürnberg
3
Open-Access-Publikationsserver der Humboldt-Universität: edoc-Server
3
Radboud University: DSpace
3
ScienceDirect (Elsevier)
3
Eldorado - Repositorium der TU Dortmund
2
IOP Publishing
2
NASA Technical Reports Server (NTRS)
2
ScienceDirect (Elsevier - via Crossref)
2
CERN Document Server (CDS)
1
DSpace@MIT (Massachusetts Institute of Technology)
1
PubMed Central (PMC)
1
RWTH Aachen University: RWTH Publications
1
Università degli Studi di Bari Aldo Moro: CINECA IRIS
1