Content Provider
LeibnizOpen (The Leibniz Association)
20
Stockholm University Press
4
DataCite Metadata Store (German National Library of Science and Technology)
3
Unknown
3
Directory of Open Access Journals: DOAJ Articles
1
Niedersächsisches Online-Archiv NOA
1
ScienceDirect (Elsevier - via Crossref)
1
Springer Nature (via Crossref)
1
University of Copenhagen: Research
1
York University, Toronto: YorkSpace
1