BAXTER, Glen; JOICHI, J. T. On Permutations Induced by Commuting Functions, and an Embedding Question. Mathematica Scandinavica, Berkeley, CA, United States, v. 13, p. 140–150, 1963. DOI: 10.7146/math.scand.a-10696. Disponível em: https://journals.msp.org/mscand/article/view/2628. Acesso em: 25 jul. 2026.