BONDESEN, Aage; BRONSTED, Arne. A dual proof of the upper bound conjecture for convex polytopes. Mathematica Scandinavica, Berkeley, CA, United States, v. 46, p. 95–102, 1980. DOI: 10.7146/math.scand.a-11854. Disponível em: https://journals.msp.org/mscand/article/view/1794. Acesso em: 25 jul. 2026.