On the Cauchy problem for first-order hyperbolic systems with multiple characteristics
Doklady Akademii Nauk, Tome 209 (1973) no. 4, pp. 795-797.

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@article{DAN_1973_209_4_a10,
     author = {V. M. Petkov},
     title = {On the {Cauchy} problem for first-order hyperbolic systems with multiple characteristics},
     journal = {Doklady Akademii Nauk},
     pages = {795--797},
     publisher = {mathdoc},
     volume = {209},
     number = {4},
     year = {1973},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1973_209_4_a10/}
}
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V. M. Petkov. On the Cauchy problem for first-order hyperbolic systems with multiple characteristics. Doklady Akademii Nauk, Tome 209 (1973) no. 4, pp. 795-797. http://geodesic.mathdoc.fr/item/DAN_1973_209_4_a10/