@article{DE_1975_11_4_a14,
     author = {N. V. Kislov},
     title = {A boundary value problem for a second order operator-differential equation of the type of the {Tricomi} equation},
     journal = {Differencialʹnye uravneni\^a},
     pages = {718--726},
     publisher = {mathdoc},
     volume = {11},
     number = {4},
     year = {1975},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1975_11_4_a14/}
}