Content Provider
Directory of Open Access Journals: DOAJ Articles
3
Electrical Engineering and Power Engineering (EE&PE - E-Journal)
2
Izvestiya Rossiiskoi Akademii Nauk. Seriya Geograficheskaya
2
Pensoft Publishers
2
Scientific Periodicals of Ukraine (Ukrainian Research and Academic Network)
2
Vernadsky National Library of Ukraine: DSpace
2
BIROn - Birkbeck Institutional Research Online (Birkbeck University of London)
1
Cambridge University Press
1
HELDA – University of Helsinki Open Repository
1
SAGE Publications
1
ScienceDirect (Elsevier - via Crossref)
1