THOMSEN, Klaus. Discrete asymptotic homomorphisms in E-theory and KK-theory. Mathematica Scandinavica, Berkeley, CA, United States, v. 92, n. 1, p. 103–128, 2003. DOI: 10.7146/math.scand.a-14396. Disponível em: https://journals.msp.org/mscand/article/view/823. Acesso em: 24 jul. 2026.