@article{DE_1982_18_1_a8,
     author = {Ch. T. Nguyen},
     title = {A problem of {Tricomi} type for the {Lavrent'ev--Bitsadze} equation in a domain with an infinite set of characteristic triangles},
     journal = {Differencialʹnye uravneni\^a},
     pages = {81--92},
     publisher = {mathdoc},
     volume = {18},
     number = {1},
     year = {1982},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1982_18_1_a8/}
}