CURTIS, Frank. On formulas for the Frobenius number of a numerical semigroup. Mathematica Scandinavica, Berkeley, CA, United States, v. 67, p. 190–192, 1990. DOI: 10.7146/math.scand.a-12330. Disponível em: https://journals.msp.org/mscand/article/view/1349. Acesso em: 24 jul. 2026.