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 [Internet]. 2022 Dec. 29 [cited 2026 Jan. 21];25(4):325-40. Available from: https://twinhead.imath.kiev.ua/index.php/nosc/article/view/1076