“On the Qualitative Analysis of Solutions of a Class of Nonlinear Differential Equations of Second-Order With Constant Delay”. Neliniini Kolyvannya 25, no. 1 (March 29, 2022): 108–118. Accessed March 10, 2026. https://twinhead.imath.kiev.ua/index.php/nosc/article/view/1060.