Content Provider
DataCite Metadata Store (German National Library of Science and Technology)
7
Digital Repository of Scientific Institutes (RCIN)
2
University of Wisconsin, Milwaukee: UWM Libraries Digital Collections
2
Unknown
2
epub.oeaw (The digital publication portal of the Austrian Academy of Sciences)
2
Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe)
1
Biologie in unserer Zeit (BiuZ - E-Journal)
1
Directory of Open Access Journals: DOAJ Articles
1
EconStor (German National Library of Economics, ZBW)
1
OPUS - Publication Server of the University of Stuttgart
1
University of Washington, Seattle: Digital Collections
1
ePLUS - Open Access Publikationsserver der Universität Salzburg
1