@article{DAN_1966_169_3_a8,
     author = {O. A. Oleinik},
     title = {The {Cauchy} problem and a boundary value problem for hyperbolic equations of the second order degenerating in the region and on its boundary},
     journal = {Doklady Akademii Nauk},
     pages = {525--528},
     publisher = {mathdoc},
     volume = {169},
     number = {3},
     year = {1966},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1966_169_3_a8/}
}