PLONKA, Ernest. On symmetric words in the symmetric group of degree three. Mathematica Scandinavica, Berkeley, CA, United States, v. 99, n. 1, p. 5–16, 2006. DOI: 10.7146/math.scand.a-14997. Disponível em: https://journals.msp.org/mscand/article/view/700. Acesso em: 24 jul. 2026.