Content Provider
ArXiv.org (Cornell University Library)
72
DataCite Metadata Store (German National Library of Science and Technology)
68
SciTec Connect (Office of Scientific and Technical Information - OSTI, U.S. Department of Energy)
57
Università degli studi di Trieste: ArTS (Archivio della ricerca di Trieste)
19
Caltech Authors (California Institute of Technology)
10
Harvard University: DASH - Digital Access to Scholarship at Harvard
8
The University of Arizona: UA Campus Repository
7
Cardiff University: ORCA (Online Research @ Cardiff)
6
Macquarie University Research Portal
4
Dalhousie University: DalSpace Institutional Repository
3
Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe)
2
HAL Sorbonne Université
2
Institut national des sciences de l'Univers: HAL-INSU
2
AIP Publishing
1
APS Publications (American Physical Society - via Crossref)
1
DSpace@MIT (Massachusetts Institute of Technology)
1
EPFL Infoscience (Ecole Polytechnique Fédérale Lausanne)
1
IOP Publishing
1
University of Michigan: Deep Blue
1