%0 Journal Article %A V. M. Isakov %T On the existence of solutions of inverse problems of potential theory %J Doklady Akademii Nauk %D 1978 %P 771-773 %V 240 %N 4 %I mathdoc %U http://geodesic.mathdoc.fr/item/DAN_1978_240_4_a3/ %G ru %F DAN_1978_240_4_a3