PERESTYUK, N. A.; SLYUSARCHUK, V. Yu. Periodic solutions of nonlinear differential equations with pulse influence in a banach space. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 47, n. 3, p. 370–380, 1995. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/5426. Acesso em: 5 dec. 2025.