@article{05169466,
title = {Carleman estimates for second-order hyperbolic equations.},
journal = {Sibirskij Matematicheskij Zhurnal},
volume = {47},
year = {2006},
pages = {169-187},
zbl = {1113.35112},
language = {en},
url = {http://dml.mathdoc.fr/item/05169466}
}
Romanov, V.G. Carleman estimates for second-order hyperbolic equations.. Sibirskij Matematicheskij Zhurnal, Tome 47 (2006) pp. 169-187. http://gdmltest.u-ga.fr/item/05169466/