FLUCH, W. Maximal-Fastperiodizität von Gruppen I. Mathematica Scandinavica, Berkeley, CA, United States, v. 16, p. 148–158, 1965. DOI: 10.7146/math.scand.a-10754. Disponível em: https://journals.msp.org/mscand/article/view/2570. Acesso em: 25 jul. 2026.