ROGOVCHENKO, S. P. Application of asymptotic method to the study of one hyperbolic impulse system. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 40, n. 2, p. 244–248, 1988. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/9126. Acesso em: 6 dec. 2025.