SAMOILENKO, A. M. Some problems of the linear theory of systems of ordinary differential equations. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 63, n. 2, p. 237–269, 2011. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/2714. Acesso em: 5 dec. 2025.