@article{DE_1986_22_11_a15,
     author = {K. B. Sabitov},
     title = {The {Tricomi} problem for the {Lavrent'ev--Bitsadze} equation with a spectral parameter},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1977--1984},
     publisher = {mathdoc},
     volume = {22},
     number = {11},
     year = {1986},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1986_22_11_a15/}
}