CIVIN, Paul. Ideals in the Second Conjugate Algebra of a Group Algebra. Mathematica Scandinavica, Berkeley, CA, United States, v. 11, p. 161–174, 1962. DOI: 10.7146/math.scand.a-10663. Disponível em: https://journals.msp.org/mscand/article/view/2682. Acesso em: 25 jul. 2026.