SELMER, Ernst S. On regular Frobenius bases. Mathematica Scandinavica, Berkeley, CA, United States, v. 63, p. 109–116, 1988. DOI: 10.7146/math.scand.a-12227. Disponível em: https://journals.msp.org/mscand/article/view/1440. Acesso em: 24 jul. 2026.