%0 Journal Article %A A. M. Sarsenbiev %T Some properties of root vectors of a binomial fourth-order differential operator %J Differencialʹnye uravneniâ %D 1990 %P 171-174 %V 26 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/item/DE_1990_26_1_a24/ %G ru %F DE_1990_26_1_a24