Geodesic
The Cauchy problem for nonstrictly hyperbolic equations of second order
Doklady Akademii Nauk, Tome 201 (1971) no. 4, pp. 778-781.

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@article{DAN_1971_201_4_a3,
     author = {V. Ya. Ivrii},
     title = {The {Cauchy} problem for nonstrictly hyperbolic equations of second order},
     journal = {Doklady Akademii Nauk},
     pages = {778--781},
     publisher = {mathdoc},
     volume = {201},
     number = {4},
     year = {1971},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1971_201_4_a3/}
}
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V. Ya. Ivrii. The Cauchy problem for nonstrictly hyperbolic equations of second order. Doklady Akademii Nauk, Tome 201 (1971) no. 4, pp. 778-781. http://geodesic.mathdoc.fr/item/DAN_1971_201_4_a3/