Slyusarchuk, V. Yu. “Conditions for the Existence of Bounded Solutions of Nonlinear Differential and Functional Differential Equations”. Ukrains’kyi Matematychnyi Zhurnal 62, no. 6 (June 25, 2010): 837–846. Accessed May 3, 2024. https://umj.imath.kiev.ua/index.php/umj/article/view/2914.