Content Provider
LeibnizOpen (The Leibniz Association)
19
Unknown
3
DataCite Metadata Store (German National Library of Science and Technology)
2
EconStor (German National Library of Economics, ZBW)
1
Kyoto University Research Information Repository (KURENAI)
1
Lund University Publications (LUP)
1
National Institute of Polar Research Repository, Japan
1
Natural Environment Research Council: NERC Open Research Archive
1
Norwegian Institute of international affairs: NUPI Research Online (Brage)
1
Ohio State University (OSU): Knowledge Bank
1