%0 Journal Article %A V. E. Raspopov %A V. P. Shapeev %A N. N. Yanenko %T $D$ properties of a system of equations for symmetric gas flows %J Doklady Akademii Nauk %D 1979 %P 308-311 %V 244 %N 2 %I mathdoc %U http://geodesic.mathdoc.fr/item/DAN_1979_244_2_a10/ %G ru %F DAN_1979_244_2_a10