Geodesic
On strong evolution inequalities for the equations $u_{tt}=a(t)u_{xx}$
Matematičeskie zametki, Tome 57 (1995) no. 6, pp. 913-916 
É. B. Bykhovskii. On strong evolution inequalities for the equations $u_{tt}=a(t)u_{xx}$. Matematičeskie zametki, Tome 57 (1995) no. 6, pp. 913-916. http://geodesic.mathdoc.fr/item/MZM_1995_57_6_a9/
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     title = {On~strong evolution inequalities for the equations $u_{tt}=a(t)u_{xx}$},
     journal = {Matemati\v{c}eskie zametki},
     pages = {913--916},
     year = {1995},
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     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1995_57_6_a9/}
}
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Voir la notice de l'article provenant de la source Math-Net.Ru

[1] Yakubovich V. A., Starzhinskii V. M., Lineinye differentsialnye uravneniya s periodicheskimi koeffitsientami i ikh prilozheniya, Nauka, M., 1972

[2] Smirnov V. I., Kurs vysshei matematiki, T. 3, ch. 2, Nauka, M., 1974