%0 Journal Article %A A. K. Urinov %A K. T. Karimov %T The Dirichlet problem for a three-dimensional equation of mixed type with three singular coefficients %J Journal of Samara State Technical University, Ser. Physical and Mathematical Sciences %D 2017 %P 665-683 %V 21 %N 4 %I mathdoc %U http://geodesic.mathdoc.fr/item/VSGTU_2017_21_4_a4/ %G ru %F VSGTU_2017_21_4_a4