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Start Over You searched for: Publication type Journal article ✖ Remove constraint Publication type: Journal article Author Gillenkirch, Robert M ✖ Remove constraint Author: Gillenkirch, Robert M Author Velthuis, Louis J ✖ Remove constraint Author: Velthuis, Louis J Data source Crossref ✖ Remove constraint Data source: Crossref Reporting date Unknown ✖ Remove constraint Reporting date: Unknown