@article{DE_1981_17_3_a14,
     author = {N. P. Kulikov},
     title = {The {Riemann} method for degenerating quasilinear hyperbolic equations of second order},
     journal = {Differencialʹnye uravneni\^a},
     pages = {566--567},
     publisher = {mathdoc},
     volume = {17},
     number = {3},
     year = {1981},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1981_17_3_a14/}
}