JESSEN, Borge. The Algebra of Polyhedra and the Dehn-Sydler Theorem. Mathematica Scandinavica, Berkeley, CA, United States, v. 22, p. 241–256, 1968. DOI: 10.7146/math.scand.a-10888. Disponível em: https://journals.msp.org/mscand/article/view/2417. Acesso em: 25 jul. 2026.