MANUILOV, V.; THOMSEN, K. Extensions of $C^*$-algebras and translation invariant asymptotic homomorphisms. MATHEMATICA SCANDINAVICA, [S. l.], v. 100, n. 1, p. 131–160, 2007. DOI: 10.7146/math.scand.a-15018. Disponível em: https://tidsskrift.dk/math/article/view/15018. Acesso em: 13 aug. 2026.