@article{DAN_1971_201_3_a5,
     author = {M. Meredov},
     title = {On the {Darboux} problem for a degenerating hyperbolic system},
     journal = {Doklady Akademii Nauk},
     pages = {538--541},
     publisher = {mathdoc},
     volume = {201},
     number = {3},
     year = {1971},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1971_201_3_a5/}
}