ZATORSKY, R.A.; SEMENCHUK, A.V. Periodic recurrent fractions of third degree. Carpathian Mathematical Publications, [S. l.], v. 2, n. 1, p. 72–81, 2010. Disponível em: https://ktipe.pnu.edu.ua/index.php/cmp/article/view/3993. Acesso em: 6 jun. 2025.