RIEFFEL, Marc A. Actions of finite groups on $C^*$-algebras. Mathematica Scandinavica, Berkeley, CA, United States, v. 47, p. 157–176, 1980. DOI: 10.7146/math.scand.a-11882. Disponível em: https://journals.msp.org/mscand/article/view/1761. Acesso em: 25 jul. 2026.