@article{SMZ_2006__47_1_53126,
     author = {Romanov, V.G.},
     title = {Carleman estimates for second-order hyperbolic equations.},
     journal = {Sibirskij Matematicheskij Zhurnal},
     pages = {169},
     publisher = {mathdoc},
     volume = {47},
     number = {1},
     year = {2006},
     zbl = {1113.35112},
     language = {en},
     url = {https://geodesic-test.mathdoc.fr/item/SMZ_2006__47_1_53126/}
}