%0 Journal Article %A V. I. Korzyuk %T An energy inequality for a boundary value problem for a third-order hyperbolic equation with a wave operator %J Differencialʹnye uravneniâ %D 1991 %P 1014-1022 %V 27 %N 6 %I mathdoc %U http://geodesic.mathdoc.fr/item/DE_1991_27_6_a13/ %G ru %F DE_1991_27_6_a13