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LeibnizOpen (The Leibniz Association)
22
Unknown
3
Copernicus Publications: E-Journals
2
Niedersächsisches Online-Archiv NOA
2
DataCite Metadata Store (German National Library of Science and Technology)
1
Renate - Repositorium für Naturwissenschaften und Technik (TIB Hannover)
1
ScienceDirect (Elsevier - via Crossref)
1
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