THAHEEM, A. B.; DAELE, A. V. A result on two one-parameter groups of automorphisms. MATHEMATICA SCANDINAVICA, [S. l.], v. 51, p. 261–274, 1982. DOI: 10.7146/math.scand.a-11980. Disponível em: https://www.mscand.dk/article/view/11980. Acesso em: 29 apr. 2024.