@article{MZM_1968_4_2_a9,
     author = {A. F. Filippov},
     title = {On the first boundary problem for a~hyperbolic equation in an arbitrary cylinder},
     journal = {Matemati\v{c}eskie zametki},
     pages = {181--189},
     publisher = {mathdoc},
     volume = {4},
     number = {2},
     year = {1968},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1968_4_2_a9/}
}