@article{00806190, title = {On a Darboux problem for a third-order hyperbolic equation with multiple characteristics.}, journal = {Georgian Mathematical Journal}, volume = {2}, year = {1995}, pages = {469-490}, doi = {10.1007/BF02259669}, zbl = {0833.35084}, language = {en}, url = {http://dml.mathdoc.fr/item/00806190} }
Jokhadze, O. On a Darboux problem for a third-order hyperbolic equation with multiple characteristics.. Georgian Mathematical Journal, Tome 2 (1995) pp. 469-490. doi : 10.1007/BF02259669. http://gdmltest.u-ga.fr/item/00806190/