@article{01897151,
title = {A nonlocal problem for fourth order hyperbolic equations with multiple characteristics.},
journal = {Electronic Journal of Differential Equations (EJDE) [electronic only]},
volume = {2002},
year = {2002},
zbl = {1011.35090},
language = {en},
url = {http://dml.mathdoc.fr/item/01897151}
}
Midodashvili, Bidzina. A nonlocal problem for fourth order hyperbolic equations with multiple characteristics.. Electronic Journal of Differential Equations (EJDE) [electronic only], Tome 2002 (2002) . http://gdmltest.u-ga.fr/item/01897151/