%0 Journal Article %A M. M. Meredova %T Completeness of eigenfunctions in the eigenvalue problem for a sixth-order equation of mixed-composite type %J Differencialʹnye uravneniâ %D 1984 %P 2171-2173 %V 20 %N 12 %I mathdoc %U http://geodesic.mathdoc.fr/item/DE_1984_20_12_a23/ %G ru %F DE_1984_20_12_a23