Content Provider
Frontiers: Figshare
25
Directory of Open Access Journals: DOAJ Articles
10
DataCite Metadata Store (German National Library of Science and Technology)
8
PubMed Central (PMC)
6
Frontiers (Publisher)
3
Springer Nature (via Crossref)
3
University of California: eScholarship
2
Institute of Botany: IBCAS OpenIR (Chinese Academy Of Sciences)
1
Smithsonian Institution: Figshare
1