@article{01208825,
title = {On the solvability of a multidimensional version of the Goursat problem for a second order hyperbolic equation with characteristic degeneration.},
journal = {Memoirs on Differential Equations and Mathematical Physics},
volume = {12},
year = {1997},
pages = {89-103},
zbl = {0910.35082},
language = {en},
url = {http://dml.mathdoc.fr/item/01208825}
}
Kharibegashvili, Sergo. On the solvability of a multidimensional version of the Goursat problem for a second order hyperbolic equation with characteristic degeneration.. Memoirs on Differential Equations and Mathematical Physics, Tome 12 (1997) pp. 89-103. http://gdmltest.u-ga.fr/item/01208825/