@article{DE_1975_11_1_a7,
     author = {V. A. Il'in},
     title = {A theorem on the uniqueness and membership in the class $W_2^1$ of the classical solution of a mixed problem for a nonselfadjoint hyperbolic equation in an arbitrary cylinder},
     journal = {Differencialʹnye uravneni\^a},
     pages = {60--65},
     publisher = {mathdoc},
     volume = {11},
     number = {1},
     year = {1975},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1975_11_1_a7/}
}