@article{DAN_1973_213_6_a7,
     author = {G. L. Chernyshov},
     title = {On the solvability of a {Cauchy} problem},
     journal = {Doklady Akademii Nauk},
     pages = {1258--1261},
     publisher = {mathdoc},
     volume = {213},
     number = {6},
     year = {1973},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1973_213_6_a7/}
}