KLEE, V.; OLECH, C. Characterizations of a Class of Convex Sets. MATHEMATICA SCANDINAVICA, [S. l.], v. 20, p. 290–296, 1967. DOI: 10.7146/math.scand.a-10839. Disponível em: https://www.mscand.dk/article/view/10839. Acesso em: 3 may. 2024.