%0 Journal Article %A V. V. Kucherenko %A L. Yu. Motylev %T The limits of applicability of the canonical operator method for nonstrictly hyperbolic equations with nonsmooth characteristics %J Izvestiya. Mathematics %D 1987 %P 95-117 %V 29 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/item/IM2_1987_29_1_a5/ %G en %F IM2_1987_29_1_a5