QUIGG, John C. Lanstad Duality for $C^*$-Coactions. Mathematica Scandinavica, Berkeley, CA, United States, v. 71, p. 277–294, 1992. DOI: 10.7146/math.scand.a-12429. Disponível em: https://journals.msp.org/mscand/article/view/1218. Acesso em: 24 jul. 2026.