TY - JOUR AU - R. K. Romanovskii TI - Tests for boundedness of the solutions of a certain mixed boundary value problem for a second order hyperbolic equation in a Banach space JO - Izvestiâ vysših učebnyh zavedenij. Matematika PY - 1969 SP - 60 EP - 66 IS - 1 UR - http://geodesic.mathdoc.fr/item/IVM_1969_1_a9/ LA - ru ID - IVM_1969_1_a9 ER -