%0 Journal Article %A K. I. Babenko %T The maximum principle for the Euler--Tricomi equation %J Doklady Akademii Nauk %D 1985 %P 777-782 %V 285 %N 4 %I mathdoc %U http://geodesic.mathdoc.fr/item/DAN_1985_285_4_a0/ %G ru %F DAN_1985_285_4_a0