%0 Journal Article %A M. M. Smirnov %T A boundary value problem with shift for a fourth order equation of mixed-composite type %J Differencialʹnye uravneniâ %D 1975 %P 1678-1686 %V 11 %N 9 %I mathdoc %U http://geodesic.mathdoc.fr/item/DE_1975_11_9_a15/ %G ru %F DE_1975_11_9_a15