@article{MZM_1999_66_5_a11,
     author = {Yu. G. Rykov},
     title = {Propagation of singularities of shock wave type in a~system of equations of two-dimensional pressureless gas dynamics},
     journal = {Matemati\v{c}eskie zametki},
     pages = {760--769},
     publisher = {mathdoc},
     volume = {66},
     number = {5},
     year = {1999},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1999_66_5_a11/}
}