@article{VKAM_2021_34_1_a2,
     author = {K. T. Karimov},
     title = {The keldysh problem for a mixed-type three-dimensional equation with three singular coefficients},
     journal = {Vestnik KRAUNC. Fiziko-matemati\v{c}eskie nauki},
     pages = {29--46},
     publisher = {mathdoc},
     volume = {34},
     number = {1},
     year = {2021},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/VKAM_2021_34_1_a2/}
}