TOMS, Andrew S. Strong perforation in infinitely generated $\mathrm{K}_0$-groups of simple $C^*$-algebras. Mathematica Scandinavica, Berkeley, CA, United States, v. 96, n. 1, p. 147–160, 2005. DOI: 10.7146/math.scand.a-14949. Disponível em: https://journals.msp.org/mscand/article/view/748. Acesso em: 24 jul. 2026.