Content Provider
LeibnizOpen (The Leibniz Association)
21
DataCite Metadata Store (German National Library of Science and Technology)
2
Unknown
2
Copernicus Publications: E-Journals
1
KITopen (Karlsruhe Institute of Technologie)
1
Niedersächsisches Online-Archiv NOA
1
PuSH - Publikationsserver des Helmholtz Zentrums München
1