%0 Journal Article %A B. S. Ablabekov %A A. K. Goroev %T On the definition of a time-dependent lower coefficient in a third-order hyperbolic equation %J Vestnik KRAUNC. Fiziko-matematičeskie nauki %D 2021 %P 9-18 %V 34 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/item/VKAM_2021_34_1_a0/ %G ru %F VKAM_2021_34_1_a0