KAUFMAN, R. On Menshoff’s Set of Multiplicity. Mathematica Scandinavica, Berkeley, CA, United States, v. 34, p. 235–240, 1974. DOI: 10.7146/math.scand.a-11525. Disponível em: https://journals.msp.org/mscand/article/view/2122. Acesso em: 25 jul. 2026.