Content Provider
Directory of Open Access Journals: DOAJ Articles
3
MDPI Open Access Publishing
2
University of Tasmania: UTas ePrints
2
DataCite Metadata Store (German National Library of Science and Technology)
1
Earth-Prints (Istituto Nazionale di Geofisica e Vulcanologia)
1
Hong Kong Polytechnic University: PolyU Institutional Repository (PolyU IR)
1
Utrecht University Repository
1