%0 Journal Article %A A. V. Bitsadze %T Waves in the flow of a fluid of variable density %J Differencialʹnye uravneniâ %D 1978 %P 1053-1059 %V 14 %N 6 %I mathdoc %U http://geodesic.mathdoc.fr/item/DE_1978_14_6_a9/ %G ru %F DE_1978_14_6_a9