Content Provider
Unknown
40
HELDA – University of Helsinki Open Repository
23
University of Toronto: Research Repository T-Space
17
BioMed Central
8
Umeå University: Publications (DiVA)
6
Kazan Federal University Digital Repository
4
NORA (National aggregator of open repositories of Russian universities)
4
OpenEdition
4
PUB - Publications at Bielefeld University
4
Hindawi Publishing Corporation
3
Pamukkale University Repository
3
Ural Federal University (URFU): ELAR
3
DataCite Metadata Store (German National Library of Science and Technology)
2
Delft University of Technology: Institutional Repository
2
Georg-August-Universität Göttingen: GoeScholar
2
Muğla Sıtkı Koçman University Institutional Repository (DSpace@Muğla)
2
Repositorio Institucional de la UPCH (Universidad Peruana Cayetano Heredia)
2
Royal Institute of Technology, Stockholm: KTHs Publication Database DiVA
2
University of Freiburg: FreiDok
2
University of Southampton: e-Prints Soton
2
Aalto University Publication Archive (Aaltodoc)
1
Arca (BC's Digital Treasures)
1
DSpace@IIT Bombay (Indian Institute of Technology)
1
Digital Commons University of South Florida (USF)
1
Falmouth University Research Repository (FURR)
1
Ghent University Academic Bibliography
1
Hrčak - Portal of scientific journals of Croatia
1
IRUA - Institutional Repository van de Universiteit Antwerpen
1
IssueLab (Nonprofit Research)
1
Lund University Publications (LUP)
1
MedCrave
1
Newcastle University Library ePrints Service
1
PubMed Central (PMC)
1
SSOAR - Social Science Open Access Repository
1
The Hong Kong University of Science and Technology: HKUST Institutional Repository
1
The University of Arizona: UA Campus Repository
1
University of Alberta: Era - Education and Research Archive
1
University of Illinois at Urbana-Champaign: IDEALS (Illinois Digital Environment for Access to Learning and Scholarship)
1
University of Kent: KAR - Kent Academic Repository
1
University of South Florida St. Petersburg: Digital USFSP
1
Uppsala University: Publications (DiVA)
1
e_Buah - Biblioteca Digital de la Universidad de Alcalá
1