KATAYAMA, Y. Takesaki’s duality for a non-degenerate co-action. MATHEMATICA SCANDINAVICA, [S. l.], v. 55, p. 141–151, 1984. DOI: 10.7146/math.scand.a-12072. Disponível em: https://www.mscand.dk/article/view/12072. Acesso em: 3 may. 2024.