@article{DE_1989_25_1_a21,
     author = {E. I. Moiseev},
     title = {Completeness of a system of root functions of the {Tricomi} problem for the {Lavrent'ev--Bitsadze} equation},
     journal = {Differencialʹnye uravneni\^a},
     pages = {170--172},
     publisher = {mathdoc},
     volume = {25},
     number = {1},
     year = {1989},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1989_25_1_a21/}
}