Content Provider
Directory of Open Access Journals: DOAJ Articles
19
Unknown
11
Data Archiving and Networked Services (DANS): EASY (KNAW - Koninklijke Nederlandse Akademie van Wetenschappen)
4
IIUM Repository (IRep - International Islamic University Malaysia)
1
Royal Society of Chemistry
1
Springer Nature (via Crossref)
1
UmeƄ University: Publications (DiVA)
1