%0 Journal Article %A V. M. Isakov %T Existence of solutions of an inverse problem of potential theory %J Differencialʹnye uravneniâ %D 1980 %P 1097-1107 %V 16 %N 6 %I mathdoc %U http://geodesic.mathdoc.fr/item/DE_1980_16_6_a11/ %G ru %F DE_1980_16_6_a11