Properties of a matriciant of a linear system with impulsive effects occurring at fixed times. Neliniini Kolyvannya, [S. l.], v. 14, n. 1, p. 85–92, 2011. Disponível em: https://twinhead.imath.kiev.ua/index.php/nosc/article/view/592. Acesso em: 21 jan. 2026.