@article{IVM_1969_1_a9,
     author = {R. K. Romanovskii},
     title = {Tests for boundedness of the solutions of a~certain mixed boundary value problem for a~second order hyperbolic equation in {a~Banach} space},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {60--66},
     publisher = {mathdoc},
     number = {1},
     year = {1969},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_1969_1_a9/}
}