@article{DAN_1991_320_2_a3,
     author = {V. V. Ostapenko},
     title = {Expansion of the difference solution of the front of a shock wave},
     journal = {Doklady Akademii Nauk},
     pages = {275--279},
     year = {1991},
     volume = {320},
     number = {2},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1991_320_2_a3/}
}