OleinichenkoA. P. “Asymptotic Behavior of Solutions of Systems of Functional Differential Equations With Nonlinear Deviation of Argument”. Ukrains’kyi Matematychnyi Zhurnal 54, no. 1 (January 25, 2002): 71-77. Accessed November 22, 2024. https://umj.imath.kiev.ua/index.php/umj/article/view/4041.