LILA, D. M.; MARTYNYUK, A. A. On the theory of stability of matrix differential equations. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 61, n. 4, p. 464–471, 2009. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/3034. Acesso em: 7 dec. 2025.