@article{IM2_1987_29_1_a5,
     author = {V. V. Kucherenko and L. Yu. Motylev},
     title = {The limits of applicability of the canonical operator method for nonstrictly hyperbolic equations with nonsmooth characteristics},
     journal = {Izvestiya. Mathematics },
     pages = {95--117},
     publisher = {mathdoc},
     volume = {29},
     number = {1},
     year = {1987},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/IM2_1987_29_1_a5/}
}