V. E. Slyusarchuk, “Nonlinear differential equations with asymptotically stable solutions”, Ukr. Mat. Zhurn., vol. 50, no. 2, pp. 264–273, Feb. 1998, Accessed: Dec. 05, 2025. [Online]. Available: https://umj.imath.kiev.ua/index.php/umj/article/view/4960