@article{DAN_1977_235_1_a0,
     author = {F. T. Baranovskii},
     title = {The {Cauchy} problem for a hyperbolic equation with degenerating principal part},
     journal = {Doklady Akademii Nauk},
     pages = {11--14},
     publisher = {mathdoc},
     volume = {235},
     number = {1},
     year = {1977},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1977_235_1_a0/}
}