Content Provider
Directory of Open Access Journals: DOAJ Articles
10
University of Groningen research database
5
DataCite Metadata Store (German National Library of Science and Technology)
2
Flanders Marine Institute (VLIZ): Open Marine Archive (OMA)
2
Unknown
2
Ghent University Academic Bibliography
1
OpenEdition
1
Wageningen UR (University & Research Centre): Digital Library
1