Content Provider
Directory of Open Access Journals: DOAJ Articles
325
LeibnizOpen (The Leibniz Association)
24
DataCite Metadata Store (German National Library of Science and Technology)
8
ScienceDirect (Elsevier - via Crossref)
8
University of California: eScholarship
6
ScienceDirect (Elsevier)
5
University of California Press (via Crossref)
4
Lund University Publications (LUP)
3
Springer Nature (via Crossref)
3
University of California Press
3
Unknown
3
Cambridge University Press
2
University College London: UCL Discovery
2
DRO - Deakin Research Online
1
Imperial College London: Spiral
1
OpenMETU (Middle East Technical University)
1
Renate - Repositorium für Naturwissenschaften und Technik (TIB Hannover)
1
SAGE Publications (via Crossref)
1
University of St Andrews: Digital Research Repository
1
University of Strathclyde Glasgow: Strathprints
1
Wiley Online Library (via Crossref)
1