Content Provider
DataCite Metadata Store (German National Library of Science and Technology)
3,483
Zenodo
8
Directory of Open Access Journals: DOAJ Articles
7
MDPI Open Access Publishing
3
IOP Publishing (via Crossref)
2
LaCRIS - University of Lapland Current Research System
2
Unknown
2
Altai State University: Scientific Journals of ASU
1
Archaeology of the Eurasian Steppes (E-Journal)
1
Bibliotekovedenie [Library and Information Science] (E-Journal)
1
Civil Engineering Journal (C.E.J)
1
CyberLeninka (Scientific Electronic Library)
1
Defense Technical Information Center: DTIC Technical Reports database
1
HELDA – University of Helsinki Open Repository
1
Izvestiya Rossiiskoi Akademii Nauk. Seriya Geograficheskaya
1
Journals at the University of Arizona
1
RePEc (Research Papers in Economics)
1
Saint Petersburg State University: Research Repository (DSpace SPbU)
1
Umeå University: Publications (DiVA)
1
University of Malta: OAR@UM
1
University of Tromsø: Munin Open Research Archive
1
University of Wisconsin, Milwaukee: UWM Libraries Digital Collections
1
Università Cattolica del Sacro Cuore: PubliCatt
1