@article{DAN_1957_112_3_a4,
     author = {B. V. Shabat},
     title = {Examples of solving the {Dirichlet} problem for equations of mixed type},
     journal = {Doklady Akademii Nauk},
     pages = {386--389},
     publisher = {mathdoc},
     volume = {112},
     number = {3},
     year = {1957},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1957_112_3_a4/}
}