@article{DAN_1958_123_4_a2,
     author = {A. Kh. Gelig},
     title = {The stability of the solutions of {Cauchy} problem and the mixed problem for hyperbolic equations},
     journal = {Doklady Akademii Nauk},
     pages = {591--594},
     publisher = {mathdoc},
     volume = {123},
     number = {4},
     year = {1958},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1958_123_4_a2/}
}