@article{VKAM_2018_1_a0,
     author = {Yu. P. Apakov},
     title = {About three-dimensional analogue of the problem of {Tricomi} with parallel planes of extinction},
     journal = {Vestnik KRAUNC. Fiziko-matemati\v{c}eskie nauki},
     pages = {6--20},
     year = {2018},
     number = {1},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/VKAM_2018_1_a0/}
}