%0 Journal Article %A A. M. Minkin %T Eigenfunction expansion of a class of nonsmooth differential operators %J Differencialʹnye uravneniâ %D 1990 %P 356-358 %V 26 %N 2 %I mathdoc %U http://geodesic.mathdoc.fr/item/DE_1990_26_2_a25/ %G ru %F DE_1990_26_2_a25