@article{GMJ_1996__3_4_47604,
     author = {Kharibegashvili, S.},
     title = {On a {Darboux} type multidimensional problem for second-order hyperbolic systems.},
     journal = {Georgian mathematical journal},
     pages = {363--378},
     year = {1996},
     volume = {3},
     number = {4},
     zbl = {0858.35077},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/GMJ_1996__3_4_47604/}
}