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@article{DAN_1984_276_5_a6, author = {V. V. Kucherenko and L. Yu. Motylev}, title = {A nonstrictly hyperbolic equation with nonsmooth characteristics}, journal = {Doklady Akademii Nauk}, pages = {1056--1059}, publisher = {mathdoc}, volume = {276}, number = {5}, year = {1984}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1984_276_5_a6/} }
V. V. Kucherenko; L. Yu. Motylev. A nonstrictly hyperbolic equation with nonsmooth characteristics. Doklady Akademii Nauk, Tome 276 (1984) no. 5, pp. 1056-1059. http://geodesic.mathdoc.fr/item/DAN_1984_276_5_a6/