A numerical-analytic method for studying periodic solutions of partial integro-differential equations with impulsive effects. Neliniini Kolyvannya, [S. l.], v. 8, n. 1, p. 123–131, 2005. Disponível em: https://twinhead.imath.kiev.ua/index.php/nosc/article/view/339. Acesso em: 22 jan. 2026.