@article{IVM_1973_8_a11,
     author = {O. M. Teut},
     title = {A~problem with boundary conditions on two characteristics for a~certain system of mixed {type.~I}},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {89--100},
     publisher = {mathdoc},
     number = {8},
     year = {1973},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_1973_8_a11/}
}