Content Provider
ScienceDirect (Elsevier - via Crossref)
1,034
ScienceDirect (Elsevier)
902
Informa (via Crossref)
799
Springer Nature (via Crossref)
619
Canadian Science Publishing (via Crossref)
256
JSTOR (via Crossref)
225
Brill (via Crossref)
164
Cambridge University Press
125
The BMJ
80
Cambridge University Press (via Crossref)
67
Wiley Online Library (via Crossref)
59
University of Chicago Press (via Crossref)
49
JSTOR
48
Johns Hopkins University Press (via Crossref)
48
Canadian Science Publishing
46
Informa
45
Frontiers (Publisher)
39
Oxford University Press (via Crossref)
31
Unknown
30
Istituto Nazionale di Fisica Nucleare (INFN): Open Access Repository
25
Wiley Online Library
25
Johns Hopkins University Press
15
Scientific Research Publishing (SCIRP Open Access - via Crossref)
12
University of Zurich (UZH): ZORA (Zurich Open Repository and Archive
11
Aberdeen University Research Archive (AURA)
10
Caltech Authors (California Institute of Technology)
10
Brill
9
The BMJ (via Crossref)
9
University of Liège: ORBi (Open Repository and Bibliography)
9
The University of Queensland: UQ eSpace
7
University of California Press (via Crossref)
7
ACS Publications (via Crossref)
6
Longwoods Publishing (via Crossref)
6
Scandinavian University Press (via Crossref)
6
University of Nottingham: Repository@Nottingham
6
American Scientific Publishers (via Crossref)
5
Mark Allen (via Crossref)
5
SAGE Publications
5
DataCite Metadata Store (German National Library of Science and Technology)
4
ICE Virtual Library (ICE Publishing - via Crossref)
4
NIST Publications (National Institute of Standards and Technology - via Crossref)
4
Oxford University Press
4
SAGE Publications (via Crossref)
4
University of Chester: Chester Digital Repository
4
Utrecht University Repository
4
White Horse Press Journals (via Crossref)
4
Bentham Science Publishers (via Crossref)
3
DIAL@UCLouvain (Université catholique de Louvain)
3
DIAL@USL-B (Université Saint-Louis, Bruxelles)
3
Inderscience Publishers (via Crossref)
3
more ...