Content Provider
ScienceDirect (Elsevier)
180
Cambridge University Press
121
ScienceDirect (Elsevier - via Crossref)
99
Canadian Science Publishing (via Crossref)
92
Springer Nature (via Crossref)
78
Informa (via Crossref)
75
Frontiers (Publisher)
65
Canadian Science Publishing
60
Informa
52
University of Zurich (UZH): ZORA (Zurich Open Repository and Archive
16
Wiley Online Library
15
SAGE Publications (via Crossref)
12
SAGE Publications
10
Wiley Online Library (via Crossref)
9
IEEE Publications
6
Cambridge University Press (via Crossref)
2
De Gruyter
2
De Gruyter (via Crossref)
2
Sciendo (de Gruyter - via CrossRef)
2
Université de Lausanne (UNIL): Serval - Serveur académique lausannois
2
Utrecht University Repository
2
Aberdeen University Research Archive (AURA)
1
Caltech Authors (California Institute of Technology)
1
Hans Publishers
1
IEEE Publications (via Crossref)
1
Istituto Nazionale di Fisica Nucleare (INFN): Open Access Repository
1
Oxford University Press (via Crossref)
1
Scientific Research Publishing (SCIRP Open Access)
1
University of Nottingham: Repository@Nottingham
1
University of Vienna: Phaidra
1