@article{DE_1989_25_5_a10,
     author = {A. B. Bazarbekov},
     title = {Smoothness of the solution of the {Tricomi} problem for equations of mixed type},
     journal = {Differencialʹnye uravneni\^a},
     pages = {816--822},
     publisher = {mathdoc},
     volume = {25},
     number = {5},
     year = {1989},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1989_25_5_a10/}
}