Minimal and Maximal Solutions of Two Point Boundary-Value Problems for Second Order Differential Equations. Neliniini Kolyvannya, [S. l.], v. 4, n. 2, p. 216–225, 2001. Disponível em: https://twinhead.imath.kiev.ua/index.php/nosc/article/view/165. Acesso em: 22 jan. 2026.