Content Provider
Cambridge University Press
5,469
ScienceDirect (Elsevier - via Crossref)
2,396
Informa (via Crossref)
1,578
JSTOR (via Crossref)
1,206
Wiley Online Library (via Crossref)
1,097
Wiley Online Library
935
Informa
781
SAGE Publications (via Crossref)
499
ScienceDirect (Elsevier)
435
Springer Nature (via Crossref)
426
SAGE Publications
298
University of Zurich (UZH): ZORA (Zurich Open Repository and Archive
105
Utrecht University Repository
103
Cambridge University Press (via Crossref)
99
Istituto Nazionale di Fisica Nucleare (INFN): Open Access Repository
54
University of Toronto Press (U Toronto Press - via Crossref)
32
JSTOR
31
University of St Andrews: Digital Research Repository
30
IOP Publishing
26
DIAL@UCLouvain (Université catholique de Louvain)
21
DIAL@USL-B (Université Saint-Louis, Bruxelles)
21
Queen's University Belfast Research Portal
20
Aberdeen University Research Archive (AURA)
16
IOP Publishing (via Crossref)
16
University of Nottingham: Repository@Nottingham
10
Canadian Science Publishing (via Crossref)
9
Caltech Authors (California Institute of Technology)
8
Longwoods Publishing (via Crossref)
8
The University of Queensland: UQ eSpace
8
University of Hertfordshire: UH Research Archive
8
Université de Lausanne (UNIL): Serval - Serveur académique lausannois
8
De Gruyter (via Crossref)
7
IRIS Università degli Studi di Bologna (CRIS - Current Research Information System)
6
Padua Research Archive (IRIS - Università degli Studi di Padova)
6
Schweizerbart Science Publishers
5
Schweizerbart Science Publishers (via Crossref)
5
David Publishing Company (via Crossref)
4
IRInSubria - Institutional Repository Insubria (Università degli Studi dell’Insubria)
4
Opin vísindi (Iceland)
4
Scientific Research Publishing (SCIRP Open Access - via Crossref)
4
Universidad de Chile: Repositorio académico
4
University of Liège: ORBi (Open Repository and Bibliography)
4
ARPI - Archivio della Ricerca dell'Università di Pisa
3
DataCite Metadata Store (German National Library of Science and Technology)
3
Johns Hopkins University Press
3
Technical University of Denmark: DTU Orbit
3
University of Vienna: Phaidra
3
Università degli Studi di Milano-Bicocca: BOA (Bicocca Open Archive)
3
Università degli studi di Trieste: ArTS (Archivio della ricerca di Trieste)
3
Archivio della ricerca dell'Università di Parma (CINECA IRIS)
2
more ...