Geodesic
The Cauchy problem for nonstrictly hyperbolic equations with smooth roots
Doklady Akademii Nauk, Tome 204 (1972) no. 6, pp. 1303-1304.

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     author = {V. Ya. Ivrii},
     title = {The {Cauchy} problem for nonstrictly hyperbolic equations with smooth roots},
     journal = {Doklady Akademii Nauk},
     pages = {1303--1304},
     publisher = {mathdoc},
     volume = {204},
     number = {6},
     year = {1972},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1972_204_6_a5/}
}
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V. Ya. Ivrii. The Cauchy problem for nonstrictly hyperbolic equations with smooth roots. Doklady Akademii Nauk, Tome 204 (1972) no. 6, pp. 1303-1304. http://geodesic.mathdoc.fr/item/DAN_1972_204_6_a5/