%0 Journal Article %A B. A. Aliev %A D. Murtazaev %T All-Union Symposium on Differential and Integral Equations %J Trudy Matematicheskogo Instituta imeni V.A. Steklova %D 1973 %V 28 %N 2 %I mathdoc %U http://geodesic.mathdoc.fr/item/RM_1973_28_2_a24/ %G ru %F RM_1973_28_2_a24