BASSI, J. On $C^*$-algebras associated to actions of discrete subgroups of $\operatorname{SL}(2,\mathbb{R})$ on the punctured plane. MATHEMATICA SCANDINAVICA, [S. l.], v. 126, n. 3, p. 540–558, 2020. DOI: 10.7146/math.scand.a-120288. Disponível em: https://www.mscand.dk/article/view/120288. Acesso em: 23 apr. 2024.