@article{VSGTU_2019_23_4_a1,
     author = {Yu. K. Sabitova},
     title = {Dirichlet problem for mixed type equation with characteristic degeneration},
     journal = {Journal of Samara State Technical University, Ser. Physical and Mathematical Sciences},
     pages = {622--645},
     publisher = {mathdoc},
     volume = {23},
     number = {4},
     year = {2019},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/VSGTU_2019_23_4_a1/}
}