Content Provider
DataCite Metadata Store (German National Library of Science and Technology)
31
KITopen (Karlsruhe Institute of Technologie)
27
Ghent University Academic Bibliography
13
DESY Publication Database (PUBDB)
6
Unknown
3
Eldorado - Repositorium der TU Dortmund
2
DSpace@MIT (Massachusetts Institute of Technology)
1
RWTH Aachen University: RWTH Publications
1
ScienceDirect (Elsevier - via Crossref)
1
Università degli Studi di Bari Aldo Moro: CINECA IRIS
1