Geodesic
On the smoothness of solutions of the Cauchy problem for a second-order hyperbolic operator-differential equation
Differencialʹnye uravneniâ, Tome 23 (1987) no. 3, pp. 493-499 
A. Z. Ishmukhametov. On the smoothness of solutions of the Cauchy problem for a second-order hyperbolic operator-differential equation. Differencialʹnye uravneniâ, Tome 23 (1987) no. 3, pp. 493-499. http://geodesic.mathdoc.fr/item/DE_1987_23_3_a16/
@article{DE_1987_23_3_a16,
     author = {A. Z. Ishmukhametov},
     title = {On the smoothness of solutions of the {Cauchy} problem for a second-order hyperbolic operator-differential equation},
     journal = {Differencialʹnye uravneni\^a},
     pages = {493--499},
     year = {1987},
     volume = {23},
     number = {3},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1987_23_3_a16/}
}
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