%0 Journal Article %A V. P. Mikhailov %T Non-analytical solutions of Goursat's problem for a system of differential equations in two independent variables %J Doklady Akademii Nauk %D 1957 %P 759-762 %V 117 %N 5 %I mathdoc %U http://geodesic.mathdoc.fr/item/DAN_1957_117_5_a7/ %G ru %F DAN_1957_117_5_a7