OSPANOV, K.N.; ZULKHAZHAV, A. On the properties of solutions of one system of second order difference equations. Bulletin of the Karaganda University. Mathematics Series, [S. l.], v. 78, n. 2, p. 124–136, 2015. Disponível em: http://mts.buketov.edu.kz/index.php/mathematics-vestnik/article/view/34. Acesso em: 7 sep. 2025.