JESSEN, B. The Algebra of Polyhedra and the Dehn-Sydler Theorem. MATHEMATICA SCANDINAVICA, [S. l.], v. 22, p. 241–256, 1968. DOI: 10.7146/math.scand.a-10888. Disponível em: https://www.mscand.dk/article/view/10888. Acesso em: 9 may. 2024.