@article{VSGU_2013_6_a7,
     author = {E. A. Sozontova},
     title = {On characteristic problems for one hyperbolic system in three-dimensional space},
     journal = {Vestnik Samarskogo universiteta. Estestvennonau\v{c}na\^a seri\^a},
     pages = {74--84},
     publisher = {mathdoc},
     number = {6},
     year = {2013},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/VSGU_2013_6_a7/}
}