DzhumabaevD. S. and TemeshevaS. M. (2018) “Criteria for the existence of an isolated solution of a nonlinear boundary-value problem”, Ukrains’kyi Matematychnyi Zhurnal, 70(3), pp. 356-365. Available at: http://umj.imath.kiev.ua/index.php/umj/article/view/1561 (Accessed: 29November2020).