PELYUKH, G. P. On properties of solutions of a limit problem for systems of nonlinear functional differential equations of neutral type. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 60, n. 2, p. 217–224, 2008. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/3151. Acesso em: 6 dec. 2025.