Content Provider
Zenodo
167
Charles University CU Digital repository
4
Pensoft Publishers
2
Ghent University Academic Bibliography
1
HELDA – University of Helsinki Open Repository
1
Helsingfors Universitet: HELDA – Helsingin yliopiston digitaalinen arkisto
1
The University of Adelaide: Digital Library
1
University College London: UCL Discovery
1
University of Lodz Repository (RUŁ)
1
Unknown
1