%0 Journal Article %A N. T. Durdyev %A M. B. Orazov %T Completeness of the root functions in some eigenvalue problems for fourth-order equations of mixed type %J Differencialʹnye uravneniâ %D 1984 %P 174-176 %V 20 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/item/DE_1984_20_1_a24/ %G ru %F DE_1984_20_1_a24