PelyukhG. P. “On Properties of Solutions of a Limit Problem for Systems of Nonlinear Functional Differential Equations of Neutral Type”. Ukrains’kyi Matematychnyi Zhurnal 60, no. 2 (February 25, 2008): 217–224. Accessed November 22, 2024. https://umj.imath.kiev.ua/index.php/umj/article/view/3151.