New solvability conditions for a non-local boundary value problem for nonlinear functional differential equations. Нелінійні коливання, [S. l.], v. 11, n. 3, p. 365–386, 2008. Disponível em: https://twinhead.imath.kiev.ua/index.php/nosc/article/view/486. Acesso em: 21 січ. 2026.