%0 Journal Article %A E. V. Radkevich %A B. O. Èshonkulov %T On the existence of the classical solution of the problem of %J Doklady Akademii Nauk %D 1992 %P 668-673 %V 325 %N 4 %I mathdoc %U http://geodesic.mathdoc.fr/item/DAN_1992_325_4_a4/ %G ru %F DAN_1992_325_4_a4