Gorodny , M. F. “Limited and Periodical Solutions of One Differential Equation and Its Stochastic Analog in the Banach Space”. Ukrains’kyi Matematychnyi Zhurnal 43, no. 1 (January 18, 1991): 41–46. Accessed December 7, 2025. https://umj.imath.kiev.ua/index.php/umj/article/view/9303.