@article{VSGTU_2017_21_4_a4,
     author = {A. K. Urinov and K. T. Karimov},
     title = {The {Dirichlet} problem for a three-dimensional equation of mixed type with three singular coefficients},
     journal = {Journal of Samara State Technical University, Ser. Physical and Mathematical Sciences},
     pages = {665--683},
     publisher = {mathdoc},
     volume = {21},
     number = {4},
     year = {2017},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/VSGTU_2017_21_4_a4/}
}