HEESWIJCK, L. V. Duality in the theory of crossed products. MATHEMATICA SCANDINAVICA, [S. l.], v. 44, p. 313–329, 1979. DOI: 10.7146/math.scand.a-11813. Disponível em: https://www.mscand.dk/article/view/11813. Acesso em: 8 may. 2024.