@article{DE_1978_14_3_a13,
     author = {A. D. Sidorenko},
     title = {A problem with a contact discontinuity for a system of three quasilinear equations},
     journal = {Differencialʹnye uravneni\^a},
     pages = {504--511},
     publisher = {mathdoc},
     volume = {14},
     number = {3},
     year = {1978},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1978_14_3_a13/}
}