@article{00733306, title = {About the existence and uniqueness theorem for hyperbolic equation.}, journal = {International Journal of Mathematics and Mathematical Sciences}, volume = {18}, year = {1995}, pages = {141-146}, doi = {10.1155/S0161171295000184}, zbl = {0819.35090}, language = {en}, url = {http://dml.mathdoc.fr/item/00733306} }
Khalifa, M.E. About the existence and uniqueness theorem for hyperbolic equation.. International Journal of Mathematics and Mathematical Sciences, Tome 18 (1995) pp. 141-146. doi : 10.1155/S0161171295000184. http://gdmltest.u-ga.fr/item/00733306/