Content Provider
Niedersächsisches Online-Archiv NOA
165
LeibnizOpen (The Leibniz Association)
19
Stellenbosch University: SUNScholar Research Repository
9
Digital Library Thüringen
2
University of California: eScholarship
2
Unknown
2
DataCite Metadata Store (German National Library of Science and Technology)
1
Institut national de la recherche scientifique, Québec: Espace INRS
1