PEDERSEN, Gert K.; TAKAI, Hiroshi. Crossed products of $C^*$-algebras by approximately uniformly continous actions. Mathematica Scandinavica, Berkeley, CA, United States, v. 45, p. 282–288, 1979. DOI: 10.7146/math.scand.a-11843. Disponível em: https://journals.msp.org/mscand/article/view/1803. Acesso em: 25 jul. 2026.