@article{DE_1970_6_1_a21,
     author = {V. I. Pa\v{s}kovskii},
     title = {A certain mixed problem for the {Tricomi} equation},
     journal = {Differencialʹnye uravneni\^a},
     pages = {200--203},
     publisher = {mathdoc},
     volume = {6},
     number = {1},
     year = {1970},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1970_6_1_a21/}
}