%0 Journal Article %A D. P. Kouzov %T An energy principle of uniqueness for acoustic boundary value problems %J Zapiski Nauchnykh Seminarov POMI %D 1979 %P 124-133 %V 89 %I mathdoc %U http://geodesic.mathdoc.fr/item/ZNSL_1979_89_a10/ %G ru %F ZNSL_1979_89_a10