KANIUTH, Eberhard. Topological Frobenius properties for nilpotent groups. II. Mathematica Scandinavica, Berkeley, CA, United States, v. 68, p. 89–107, 1991. DOI: 10.7146/math.scand.a-12348. Disponível em: https://journals.msp.org/mscand/article/view/1285. Acesso em: 24 jul. 2026.