@article{DE_1976_12_10_a7,
     author = {V. M. Govorov},
     title = {The uniqueness of the classical (in the sense of {V.\,A.~Il'in)} solution of the mixed problem for a hyperbolic equation with time-dependent coefficients},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1804--1814},
     publisher = {mathdoc},
     volume = {12},
     number = {10},
     year = {1976},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1976_12_10_a7/}
}