ROGOVCHENKO, Yu. V. Periodic solutions of pulse evolutionary systems with unbounded nonlinearities. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 45, n. 10, p. 1390–1397, 1993. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/5944. Acesso em: 5 dec. 2025.