KLEE, Victor; OLECH, Czeslaw. 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: 5 dec. 2025.