@article{DAN_1977_237_1_a1,
     author = {F. T. Baranovskii},
     title = {On a mixed boundary value problem for a hyperbolic equation with degenerate principal part},
     journal = {Doklady Akademii Nauk},
     pages = {13--16},
     publisher = {mathdoc},
     volume = {237},
     number = {1},
     year = {1977},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1977_237_1_a1/}
}