Content Provider
SciTec Connect (Office of Scientific and Technical Information - OSTI, U.S. Department of Energy)
77
ArXiv.org (Cornell University Library)
68
DataCite Metadata Store (German National Library of Science and Technology)
65
Università degli studi di Trieste: ArTS (Archivio della ricerca di Trieste)
19
Cardiff University: ORCA (Online Research @ Cardiff)
13
Harvard University: DASH - Digital Access to Scholarship at Harvard
8
The University of Arizona: UA Campus Repository
6
Caltech Authors (California Institute of Technology)
3
Dalhousie University: DalSpace Institutional Repository
3
DSpace@MIT (Massachusetts Institute of Technology)
2
Institut national des sciences de l'Univers: HAL-INSU
2
APS Publications (American Physical Society - via Crossref)
1
IOP Publishing
1
Springer Nature (via Crossref)
1
University of Michigan: Deep Blue
1