BASSI, Jacopo. On $C^*$-algebras associated to actions of discrete subgroups of $\operatorname{SL}(2,\mathbb{R})$ on the punctured plane. Mathematica Scandinavica, Berkeley, CA, United States, v. 126, n. 3, p. 540–558, 2020. DOI: 10.7146/math.scand.a-120288. Disponível em: https://journals.msp.org/mscand/article/view/179. Acesso em: 24 jul. 2026.