[1]
O. Y. Romanenko and O. M. Sharkovsky, “Dynamics of solutions of the simplest nonlinear boundary-value problems”, Ukr. Mat. Zhurn., vol. 51, no. 6, pp. 810–826, Jun. 1999, Accessed: Feb. 17, 2026. [Online]. Available: https://umj.imath.kiev.ua/index.php/umj/article/view/4668