V. Y. Slyusarchuk, “Conditions for the existence of almost periodic solutions of nonlinear differential equations in Banach spaces”, Ukr. Mat. Zhurn., vol. 65, no. 2, pp. 307–312, Feb. 2013, Accessed: Feb. 16, 2026. [Online]. Available: https://umj.imath.kiev.ua/index.php/umj/article/view/2420