PERESTYUK, N. A.; SAMOILENKO, A. M. On the Existence of Periodic Solutions for Certain Classes of Systems of Differential Equations with Random Pulse Influence. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 53, n. 8, p. 1061–1079, 2001. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/4327. Acesso em: 6 dec. 2025.