@article{DE_1975_11_11_a13,
     author = {V. P. Egorov},
     title = {The generalized {Neumann{\textendash}Tricomi} problem},
     journal = {Differencialʹnye uravneni\^a},
     pages = {2040--2051},
     year = {1975},
     volume = {11},
     number = {11},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1975_11_11_a13/}
}