@article{00940801,
title = {On a Darboux type multidimensional problem for second-order hyperbolic systems.},
journal = {Georgian Mathematical Journal},
volume = {3},
year = {1996},
pages = {363-378},
doi = {10.1007/BF02256725},
zbl = {0858.35077},
language = {en},
url = {http://dml.mathdoc.fr/item/00940801}
}
Kharibegashvili, S. On a Darboux type multidimensional problem for second-order hyperbolic systems.. Georgian Mathematical Journal, Tome 3 (1996) pp. 363-378. doi : 10.1007/BF02256725. http://gdmltest.u-ga.fr/item/00940801/