Content Provider
Directory of Open Access Journals: DOAJ Articles
4
University of Waterloo, Canada: Institutional Repository
3
Copernicus Publications: E-Journals
2
Unknown
2
Brock University Digital Repository
1
Canadian Science Publishing (via Crossref)
1
Carleton University's Institutional Repository
1
DataCite Metadata Store (German National Library of Science and Technology)
1
MDPI Open Access Publishing
1
Niedersächsisches Online-Archiv NOA
1
PubMed Central (PMC)
1
SAGE Publications
1
University of Calgary Journal Hosting
1
University of Victoria (Canada): UVicDSpace
1