FLUCH, W. Maximal-Fastperiodizität von Gruppen II. MATHEMATICA SCANDINAVICA, [S. l.], v. 16, p. 159–163, 1965. DOI: 10.7146/math.scand.a-10755. Disponível em: https://www.mscand.dk/article/view/10755. Acesso em: 6 may. 2024.