MARSTRANDER, O. On a problem of Frobenius. MATHEMATICA SCANDINAVICA, [S. l.], v. 58, p. 161–175, 1986. DOI: 10.7146/math.scand.a-12138. Disponível em: https://www.mscand.dk/article/view/12138. Acesso em: 14 apr. 2025.