@article{DE_2002_38_12_a8,
     author = {A. P. Soldatov},
     title = {Riemann--Hilbert {Problems} for the {Lavrent'ev--Bitsadze} {System} in a {Mixed} {Domain} with a {Characteristic} 
},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1653--1663},
     publisher = {mathdoc},
     volume = {38},
     number = {12},
     year = {2002},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_2002_38_12_a8/}
}