Content Provider
Directory of Open Access Journals: DOAJ Articles
8
Frontiers: Figshare
8
MDPI Open Access Publishing
3
Saint Petersburg State University: Research Repository (DSpace SPbU)
2
Unknown
2
DataCite Metadata Store (German National Library of Science and Technology)
1
Hidrobiológica (E-Journal)
1
Revistas del Laboratorio Tecnológico del Uruguay
1
University College London: UCL Discovery
1
University of Bristol: Bristol Research
1
University of Calgary Journal Hosting
1
University of Groningen research database
1
Universität Leipzig: Qucosa
1
Zenodo
1