@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/