@article{MZM_1987_42_5_a10,
     author = {Yu. G. Rykov},
     title = {Character of propagation of disturbances in the {Cauchy} problem for quasilinear first-order equations},
     journal = {Matemati\v{c}eskie zametki},
     pages = {712--722},
     publisher = {mathdoc},
     volume = {42},
     number = {5},
     year = {1987},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1987_42_5_a10/}
}