DUBATOVSKAYA, M.V.; ROGOSIN, S.V. On an exact description of the Schottky groups of symmetries. Mathematical Modelling and Analysis, [S. l.], v. 9, n. 2, p. 137–148, 2004. DOI: 10.3846/13926292.2004.9637248. Disponível em: https://journals.vilniustech.lt/index.php/MMA/article/view/9723. Acesso em: 3 jul. 2025.