DIL'NA, N. Z.; RONTO, A. M. General conditions for the unique solvability of initial-value problem for nonlinear functional differential equations. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 60, n. 2, p. 167–172, 2008. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/3146. Acesso em: 6 dec. 2025.