@article{01347941, title = {On the Dirichlet problem in a characteristic rectangle for fourth order linear singular hyperbolic equations.}, journal = {Georgian Mathematical Journal}, volume = {6}, year = {1999}, pages = {537-552}, doi = {10.1023/A:1022910113088}, zbl = {0930.35102}, language = {en}, url = {http://dml.mathdoc.fr/item/01347941} }
Kiguradze, T. On the Dirichlet problem in a characteristic rectangle for fourth order linear singular hyperbolic equations.. Georgian Mathematical Journal, Tome 6 (1999) pp. 537-552. doi : 10.1023/A:1022910113088. http://gdmltest.u-ga.fr/item/01347941/