@article{DE_1989_25_1_a11,
     author = {E. I. Moiseev},
     title = {Disposition of the spectrum of the {Tricomi} problem for the {Lavrent'ev{\textendash}Bitsadze} equation},
     journal = {Differencialʹnye uravneni\^a},
     pages = {97--106},
     year = {1989},
     volume = {25},
     number = {1},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1989_25_1_a11/}
}