%0 Journal Article %A V. V. Dubrovskii %T An existence theorem in an inverse problem of spectral analysis %J Differencialʹnye uravneniâ %D 1997 %P 1702-1703 %V 33 %N 12 %I mathdoc %U http://geodesic.mathdoc.fr/item/DE_1997_33_12_a15/ %G ru %F DE_1997_33_12_a15