HENRARD, G. A fixed point theorem for $C^*$-crossed products with an Abelian group. MATHEMATICA SCANDINAVICA, [S. l.], v. 54, p. 27–39, 1984. DOI: 10.7146/math.scand.a-12038. Disponível em: https://www.mscand.dk/article/view/12038. Acesso em: 24 nov. 2024.