BEKKA, Mohammed E. B.; KANIUTH, Eberhard. Topological Frobenius properties for nilpotent groups. Mathematica Scandinavica, Berkeley, CA, United States, v. 63, p. 282–296, 1988. DOI: 10.7146/math.scand.a-12241. Disponível em: https://journals.msp.org/mscand/article/view/1423. Acesso em: 25 jul. 2026.