Protsakh, N.P. (2009) “Properties of solutions of a mixed problem for a nonlinear ultraparabolic equation”, Ukrains’kyi Matematychnyi Zhurnal, 61(6), pp. 795–809. Available at: https://umj.imath.kiev.ua/index.php/umj/article/view/3059 (Accessed: 26 April 2025).