Content Provider
Skemman (Iceland)
7
Wiley Online Library
7
ScienceDirect (Elsevier - via Crossref)
6
Staffordshire University: STORE - Staffordshire Online Repository
5
Western Kentucky University (WKU): TopScholar
4
White Rose Research Online (Universities of Leeds, Sheffield & York)
3
DataCite Metadata Store (German National Library of Science and Technology)
2
Imperial College London: Spiral
2
Lancaster University: Lancaster Eprints
2
SIT Digital Collections
2
Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe)
1
Cambridge University Press
1
Directory of Open Access Journals: DOAJ Articles
1
MacSphere (McMaster University)
1
Newcastle University Library ePrints Service
1
Nottingham Trent University's Institutional Repository (IRep)
1
Opin vĂsindi (Iceland)
1
PubMed Central (PMC)
1
University of Copenhagen: Research
1
Université de Nantes: HAL-UNIV-NANTES
1
Utrecht University Repository
1