MENTYNSKYI, S. M. Two-Sided Approximation of Solutions of a Multipoint Problem for an Ordinary Differential Equation with Parameters. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 57, n. 1, p. 125–130, 2005. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/3579. Acesso em: 5 dec. 2025.