%0 Journal Article %A D. V. Tunitsky %T On the Levi condition for Monge--Amp\`ere equations %J Differencialʹnye uravneniâ %D 1996 %P 1078-1088 %V 32 %N 8 %I mathdoc %U http://geodesic.mathdoc.fr/item/DE_1996_32_8_a8/ %G ru %F DE_1996_32_8_a8