@article{IVM_2001_5_a6,
     author = {K. B. Sabitov and R. R. Il'yasov},
     title = {On the ill-posedness of boundary value problems for a~class of hyperbolic equations},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {59--63},
     publisher = {mathdoc},
     number = {5},
     year = {2001},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_2001_5_a6/}
}