@article{DAN_1969_187_4_a7,
     author = {A. M. Nakhushev},
     title = {A new boundary value problem for a certain degenerate hyperbolic equation},
     journal = {Doklady Akademii Nauk},
     pages = {736--739},
     publisher = {mathdoc},
     volume = {187},
     number = {4},
     year = {1969},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1969_187_4_a7/}
}