V. Y. Slyusarchuk, “Method of local linear approximation in the theory of bounded solutions of nonlinear differential equations”, Ukr. Mat. Zhurn., vol. 61, no. 11, pp. 1541–1556, Nov. 2009, Accessed: Feb. 16, 2026. [Online]. Available: https://umj.imath.kiev.ua/index.php/umj/article/view/3120