GadjievT. S. and GasimovaE. R. (2008) “On the smoothness of a solution of the first boundary-value problem for second-order degenerate elliptic-parabolic equations”, Ukrains’kyi Matematychnyi Zhurnal, 60(6), pp. 723–736. Available at: https://umj.imath.kiev.ua/index.php/umj/article/view/3192 (Accessed: 24November2024).