DzhamalovS. Z. (2019) “Correctness of one nonlocal boundary-value problem with constant coefficient for the nonlinear mixed-type equation of the second kind of the second order in the space”, Ukrains’kyi Matematychnyi Zhurnal, 71(1), pp. 47-58. Available at: http://umj.imath.kiev.ua/index.php/umj/article/view/1418 (Accessed: 25November2020).