Content Provider
DataCite Metadata Store (German National Library of Science and Technology)
3
OPUS - Publication Server of the University of Stuttgart
2
Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe)
1
Bavarian Digital Repository (BDR - Bayerische Staatsbibliothek Munich, BSB)
1
Digital Repository of Scientific Institutes (RCIN)
1
The Portal to Texas History (University of North Texas)
1
University of Washington, Seattle: Digital Collections
1
Unknown
1