%0 Journal Article %A Ya. T. Sultanaev %T Deficiency indices and the spectrum of the nonsemibounded Sturm--Liouville operator %J Doklady Akademii Nauk %D 1984 %P 1072-1074 %V 276 %N 5 %I mathdoc %U http://geodesic.mathdoc.fr/item/DAN_1984_276_5_a10/ %G ru %F DAN_1984_276_5_a10