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Start Over You searched for: Author Dörr, Maurice ✖ Remove constraint Author: Dörr, Maurice Author Proppe, Jonny ✖ Remove constraint Author: Proppe, Jonny Author Waldvogel, Siegfried R ✖ Remove constraint Author: Waldvogel, Siegfried R Data source Crossref ✖ Remove constraint Data source: Crossref Data source OPENSCIENCE.UB ✖ Remove constraint Data source: OPENSCIENCE.UB