@article{DAN_1982_264_3_a7,
     author = {V. V. Lychagin},
     title = {The geometry and topology of shock waves},
     journal = {Doklady Akademii Nauk},
     pages = {551--555},
     publisher = {mathdoc},
     volume = {264},
     number = {3},
     year = {1982},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1982_264_3_a7/}
}