GHOSH, A.; MEIRI, C.; SARNAK, P. Commutators in $SL_2$ and Markoff surfaces I. New Zealand Journal of Mathematics, [S. l.], v. 52, p. 773–819, 2022. DOI: 10.53733/198. Disponível em: https://nzjmath.org/index.php/NZJMATH/article/view/198. Acesso em: 23 apr. 2024.