@article{DE_1980_16_4_a6,
     author = {S. I. Gaiduk and I. A. Pysko},
     title = {A mixed problem for a hyperbolic system of second-order equations with discontinuities in the initial conditions},
     journal = {Differencialʹnye uravneni\^a},
     pages = {645--659},
     publisher = {mathdoc},
     volume = {16},
     number = {4},
     year = {1980},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1980_16_4_a6/}
}