@article{02168714, title = {A characteristic initial value problem for a strictly hyperbolic system.}, journal = {International Journal of Mathematics and Mathematical Sciences}, volume = {2004}, year = {2004}, pages = {1623-1632}, doi = {10.1155/S0161171204308045}, zbl = {1065.35174}, language = {en}, url = {http://dml.mathdoc.fr/item/02168714} }
Iraniparast, Nezam. A characteristic initial value problem for a strictly hyperbolic system.. International Journal of Mathematics and Mathematical Sciences, Tome 2004 (2004) pp. 1623-1632. doi : 10.1155/S0161171204308045. http://gdmltest.u-ga.fr/item/02168714/