Content Provider
DataCite Metadata Store (German National Library of Science and Technology)
25
Ghent University Academic Bibliography
13
KITopen (Karlsruhe Institute of Technologie)
10
DESY Publication Database (PUBDB)
6
Max Planck Society: MPG.PuRe
6
ScienceDirect (Elsevier - via Crossref)
3
Unknown
3
Eldorado - Repositorium der TU Dortmund
2
CERN Document Server (CDS)
1
DSpace@MIT (Massachusetts Institute of Technology)
1
RWTH Aachen University: RWTH Publications
1
Università degli Studi di Bari Aldo Moro: CINECA IRIS
1