TY - JOUR AU - V. A. Il'in TI - 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 JO - Differencialʹnye uravneniâ PY - 1975 SP - 60 EP - 65 VL - 11 IS - 1 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/DE_1975_11_1_a7/ LA - ru ID - DE_1975_11_1_a7 ER -