PLONKA, E. On symmetric words in the symmetric group of degree three. MATHEMATICA SCANDINAVICA, [S. l.], v. 99, n. 1, p. 5–16, 2006. DOI: 10.7146/math.scand.a-14997. Disponível em: https://www.mscand.dk/article/view/14997. Acesso em: 7 apr. 2025.