Content Provider
Directory of Open Access Journals: DOAJ Articles
12
Frontiers (Publisher)
6
Oxford University Press
4
DataCite Metadata Store (German National Library of Science and Technology)
3
Oxford University Press (via Crossref)
2
ScienceDirect (Elsevier - via Crossref)
2
Canadian Science Publishing
1
Institute of Botany: IBCAS OpenIR (Chinese Academy Of Sciences)
1
Old Dominion University: ODU Digital Commons
1
ScienceDirect (Elsevier)
1
Springer Nature (via Crossref)
1
University of California: eScholarship
1
Wiley Online Library
1
Wiley Online Library (via Crossref)
1
eCite UTAS (University of Tasmania)
1