%0 Journal Article %A A. V. Kiselev %T Extremal properties of solutions of inverse boundary value %J Doklady Akademii Nauk %D 1995 %P 161-163 %V 340 %N 2 %I mathdoc %U http://geodesic.mathdoc.fr/item/DAN_1995_340_2_a3/ %G ru %F DAN_1995_340_2_a3