@article{SJIM_2011_14_2_a4,
     author = {Yu. P. Apakov},
     title = {A three-dimensional analog of the {Tricomi} problem for a~parabolic-hyperbolic equation},
     journal = {Sibirskij \v{z}urnal industrialʹnoj matematiki},
     pages = {34--44},
     publisher = {mathdoc},
     volume = {14},
     number = {2},
     year = {2011},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/SJIM_2011_14_2_a4/}
}