V. F. Davydov, “Majorant estimates for solutions of quadratic difference systems with lag”, Ukr. Mat. Zhurn., vol. 47, no. 4, pp. 542–545, Apr. 1995, Accessed: Dec. 05, 2025. [Online]. Available: https://umj.imath.kiev.ua/index.php/umj/article/view/5454