“The Cauchy problem for a system of linear inhomogeneous differential equations of the first order with a degenerate matrix at derivatives and the pulse action at fixed instants of time”, НК, vol. 25, no. 4, pp. 325–340, Dec. 2022, Accessed: Dec. 06, 2025. [Online]. Available: https://twinhead.imath.kiev.ua/index.php/nosc/article/view/1076