Content Provider
DataCite Metadata Store (German National Library of Science and Technology)
5
Ghent University Academic Bibliography
3
DataCite
2
University of St Andrews: Research Portal
2
Unknown
2
Wageningen UR (University & Research Centre): Digital Library
2
DRS Digital Library
1
Directory of Open Access Journals: DOAJ Articles
1
MDPI Open Access Publishing
1
Natural Resources Institute Finland: Jukuri
1
Norwegian Institute for Nature Research: Brage NINA
1
RODIN - Repositorio de Objetos de Docencia e Investigación de la Universidad de Cádiz
1
University of Calgary Journal Hosting
1
University of Groningen research database
1