Einen anderen Beweis gab zuvor I. Kh. Sabitov 1996, Volume of a polyhedron as a function of its metric, Fundamenti i Prikl. Mat., Band 2, 1996, S. 1235–1246. Siehe Gaidullin, Flexible polyhedra and their volumes, ECM 2016
Robert Connelly; Erik Demaine; Rote, Günter: Straightening polygonal arcs and convexifying polygonal cycles. In: Discrete and Computational Geometry. 30. Jahrgang, Nr.2, 2003, Preliminary version appeared at 41st Annual Symposium on Foundations of Computer Science, 2000, S.205–239, doi:10.1007/s00454-003-0006-7 (fu-berlin.de [PDF]).
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Robert Connelly; Erik Demaine; Rote, Günter: Straightening polygonal arcs and convexifying polygonal cycles. In: Discrete and Computational Geometry. 30. Jahrgang, Nr.2, 2003, Preliminary version appeared at 41st Annual Symposium on Foundations of Computer Science, 2000, S.205–239, doi:10.1007/s00454-003-0006-7 (fu-berlin.de [PDF]).