%0 Journal Article %A A. A. Androshchuk %T Transformation operators and a uniqueness theorem in the inverse problem for a second order differential equation %J Doklady Akademii Nauk %D 1971 %P 9-12 %V 198 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/item/DAN_1971_198_1_a0/ %G ru %F DAN_1971_198_1_a0