DZHUMABAEV, D. S.; TEMESHEVA, S. M. Criteria for the existence of an isolated solution of a nonlinear boundary-value problem. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 70, n. 3, p. 356–365, 2018. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/1561. Acesso em: 5 dec. 2025.