Content Provider
Springer Nature (via Crossref)
12
IODE-UNESCO: OceanDocs - E-Repository of Ocean Publications
9
DataCite Metadata Store (German National Library of Science and Technology)
3
OpenAgrar (OA)
3
KITopen (Karlsruhe Institute of Technologie)
1
Publication Server of Goethe University Frankfurt am Main
1
Zenodo
1