@article{DE_1994_30_11_a18,
     author = {R. S. Khairullin},
     title = {The {Tricomi} problem for an equation of mixed type of the second kind in the case of an unbounded domain},
     journal = {Differencialʹnye uravneni\^a},
     pages = {2010--2017},
     publisher = {mathdoc},
     volume = {30},
     number = {11},
     year = {1994},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1994_30_11_a18/}
}