Content Provider
DataCite Metadata Store (German National Library of Science and Technology)
59
ArXiv.org (Cornell University Library)
42
Ghent University Academic Bibliography
16
SciTec Connect (Office of Scientific and Technical Information - OSTI, U.S. Department of Energy)
14
KITopen (Karlsruhe Institute of Technologie)
10
EPFL Infoscience (Ecole Polytechnique Fédérale Lausanne)
9
Max Planck Society: MPG.PuRe
8
DESY Publication Database (PUBDB)
6
Unknown
3
Eldorado - Repositorium der TU Dortmund
2
ScienceDirect (Elsevier - via Crossref)
2
CERN Document Server (CDS)
1
Chalmers University of Technology: Chalmers research
1
DSpace@MIT (Massachusetts Institute of Technology)
1
IOP Publishing (via Crossref)
1
RWTH Aachen University: RWTH Publications
1
Università degli Studi di Bari Aldo Moro: CINECA IRIS
1