@article{DAN_1986_290_2_a9,
     author = {Ya. A. Roitberg},
     title = {The {Cauchy} problem for hyperbolic equations in a full scale of spaces of {Sobolev} type},
     journal = {Doklady Akademii Nauk},
     pages = {296--300},
     publisher = {mathdoc},
     volume = {290},
     number = {2},
     year = {1986},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1986_290_2_a9/}
}