DUDZYANYI, S. I.; PERESTYUK, N. A. On the stability of a trivial invariant torus of one class of impulsive systems. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 50, n. 3, p. 338–349, 1998. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/4935. Acesso em: 5 dec. 2025.