@article{05836297,
title = {Increasing smoothness of solutions to a hyperbolic system on the plane with delay in the boundary conditions.},
journal = {Sibirskij Matematicheskij Zhurnal},
volume = {49},
year = {2008},
pages = {1333-1350},
zbl = {1224.35267},
language = {en},
url = {http://dml.mathdoc.fr/item/05836297}
}
Lyul'ko, N.A. Increasing smoothness of solutions to a hyperbolic system on the plane with delay in the boundary conditions.. Sibirskij Matematicheskij Zhurnal, Tome 49 (2008) pp. 1333-1350. http://gdmltest.u-ga.fr/item/05836297/