RIEFFEL, M. A. Actions of finite groups on $C^*$-algebras. MATHEMATICA SCANDINAVICA, [S. l.], v. 47, p. 157–176, 1980. DOI: 10.7146/math.scand.a-11882. Disponível em: https://www.mscand.dk/article/view/11882. Acesso em: 30 apr. 2024.