%0 Journal Article %A K. T. Karimov %T The keldysh problem for a mixed-type three-dimensional equation with three singular coefficients %J Vestnik KRAUNC. Fiziko-matematičeskie nauki %D 2021 %P 29-46 %V 34 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/item/VKAM_2021_34_1_a2/ %G ru %F VKAM_2021_34_1_a2