[1]
G. P. Pelyukh, “On the existence and properties of periodic solutions of discrete difference equations”, Ukr. Mat. Zhurn., vol. 46, no. 10, pp. 1382–1387, Oct. 1994, Accessed: Dec. 06, 2025. [Online]. Available: https://umj.imath.kiev.ua/index.php/umj/article/view/5617