FRANK, Michael. Isomorphisms of Hilbert $C^*$-modules and *-isomorphisms of related operator $C^*$-algebras. Mathematica Scandinavica, Berkeley, CA, United States, v. 80, p. 313–319, 1997. DOI: 10.7146/math.scand.a-12623. Disponível em: https://journals.msp.org/mscand/article/view/1006. Acesso em: 25 jul. 2026.