@article{MZM_2009_86_5_a11,
     author = {M. S. Salakhitdinov and M. Mirsaburov},
     title = {A {Problem} with a {Nonlocal} {Boundary} {Condition} on the {Characteristic} for a {Class} of {Equations} of {Mixed} {Type}},
     journal = {Matemati\v{c}eskie zametki},
     pages = {748--760},
     publisher = {mathdoc},
     volume = {86},
     number = {5},
     year = {2009},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_2009_86_5_a11/}
}