Content Provider
Directory of Open Access Journals: DOAJ Articles
39
DataCite Metadata Store (German National Library of Science and Technology)
34
Unknown
22
Cambridge University Press
12
Utrecht University Repository
8
SAGE Publications (via Crossref)
7
DataCite
4
SAGE Publications
3
ScienceDirect (Elsevier - via Crossref)
3
Springer Nature (via Crossref)
3
University of Liège: ORBi (Open Repository and Bibliography)
3
University of California: eScholarship
2
ARPI - Archivio della Ricerca dell'Università di Pisa
1
Aberdeen University Research Archive (AURA)
1
Monthly Review
1
Monthly Review (E-Journal)
1
Queen's University Belfast Research Portal
1
Umeå University: Publications (DiVA)
1
University of Nottingham: Repository@Nottingham
1
University of Zurich (UZH): ZORA (Zurich Open Repository and Archive
1