%0 Journal Article %A D. V. Tunitsky %T Hyperbolic Monge–Ampère systems %J Sbornik. Mathematics %D 2006 %P 1223-1258 %V 197 %N 8 %U http://geodesic.mathdoc.fr/item/SM_2006_197_8_a6/ %G en %F SM_2006_197_8_a6