%0 Journal Article %A R. Sh. Bakuradze %A I. V. Stankevich %T Some identities for eigenvalues and eigenfunctions of a class of fourth-order differential operators %J Differencialʹnye uravneniâ %D 1990 %P 1483-1490 %V 26 %N 9 %I mathdoc %U http://geodesic.mathdoc.fr/item/DE_1990_26_9_a1/ %G ru %F DE_1990_26_9_a1