Geodesic
The Cauchy problem for normally hyperbolic equations with unbounded coefficients
Doklady Akademii Nauk, Tome 179 (1968) no. 2, pp. 267-270 
A. H. Gudiev. The Cauchy problem for normally hyperbolic equations with unbounded coefficients. Doklady Akademii Nauk, Tome 179 (1968) no. 2, pp. 267-270. http://geodesic.mathdoc.fr/item/DAN_1968_179_2_a4/
@article{DAN_1968_179_2_a4,
     author = {A. H. Gudiev},
     title = {The {Cauchy} problem for normally hyperbolic equations with unbounded coefficients},
     journal = {Doklady Akademii Nauk},
     pages = {267--270},
     year = {1968},
     volume = {179},
     number = {2},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1968_179_2_a4/}
}
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