Content Provider
DataCite Metadata Store (German National Library of Science and Technology)
5
Dryad Digital Repository (Duke University)
3
Directory of Open Access Journals: DOAJ Articles
2
Unknown
2
Zenodo
2
Aarhus University: Research
1
The University of Arizona: UA Campus Repository
1
University of Tromsø: Septentrio Academic Publishing
1
Università degli Studi di Ferrara: CINECA IRIS
1