Content Provider
DataCite Metadata Store (German National Library of Science and Technology)
22
Digital.CSIC (Spanish National Research Council)
2
Directory of Open Access Journals: DOAJ Articles
2
Frontiers: Figshare
1
IODE-UNESCO: OceanDocs - E-Repository of Ocean Publications
1
MDPI Open Access Publishing
1
Pohang University of Science and Technology (POSTECH): Open Access System for Information Sharing (OASIS)
1
Zenodo
1