@article{DAN_1966_170_1_a8,
     author = {A. M. Nakhushev},
     title = {Boundary value problem of mixed type with two lines of degeneracy},
     journal = {Doklady Akademii Nauk},
     pages = {38--40},
     publisher = {mathdoc},
     volume = {170},
     number = {1},
     year = {1966},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1966_170_1_a8/}
}