PELYUKH, G. P. On the Existence of Local Smooth Solutions of Systems of Nonlinear Functional Equations with Deviations Dependent on Unknown Functions. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 53, n. 1, p. 64–77, 2001. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/4222. Acesso em: 17 apr. 2025.