PELYUKH, G. P.; SAMOILENKO, A. M. On analytic solutions of nonlinear differential functional equations with nonlinear deviations of arguments. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 51, n. 2, p. 234–240, 1999. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/4602. Acesso em: 5 dec. 2025.