Content Provider
Directory of Open Access Journals: DOAJ Articles
7
DataCite Metadata Store (German National Library of Science and Technology)
5
MDPI Open Access Publishing
3
National Research Council Canada: NRC Publications Archive
2
The University of Adelaide: Digital Library
1
University of Waterloo, Canada: Institutional Repository
1
University of Western Sydney (UWS): Research Direct
1
Unknown
1
Uppsala University: Publications (DiVA)
1
ePLUS - Open Access Publikationsserver der Universität Salzburg
1