%0 Journal Article %A V. A. Malovichko %T The first boundary value problem for a fourth-order equation with a nonnegative characteristic form %J Differencialʹnye uravneniâ %D 1983 %P 712-714 %V 19 %N 4 %I mathdoc %U http://geodesic.mathdoc.fr/item/DE_1983_19_4_a26/ %G ru %F DE_1983_19_4_a26