FAN, Ky. A Covering Property of Simplexes. Mathematica Scandinavica, Berkeley, CA, United States, v. 22, p. 17–20, 1968. DOI: 10.7146/math.scand.a-10867. Disponível em: https://journals.msp.org/mscand/article/view/2432. Acesso em: 25 jul. 2026.