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. Neliniini Kolyvannya, [S. l.], v. 25, n. 4, p. 325–340, 2022. Disponível em: https://twinhead.imath.kiev.ua/index.php/nosc/article/view/1076. Acesso em: 21 jan. 2026.