@article{DAN_1980_255_1_a4,
     author = {N. V. Kislov},
     title = {Boundary value problems for an equation of mixed type in a rectangular domain},
     journal = {Doklady Akademii Nauk},
     pages = {26--30},
     publisher = {mathdoc},
     volume = {255},
     number = {1},
     year = {1980},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1980_255_1_a4/}
}