EVANS, R. J.; ISAACS, I. M. Fields generated by linear combinations of roots of unity, II. MATHEMATICA SCANDINAVICA, [S. l.], v. 43, p. 26–34, 1978. DOI: 10.7146/math.scand.a-11759. Disponível em: https://www.mscand.dk/article/view/11759. Acesso em: 2 may. 2024.