@article{VSGTU_2011_125_4_a4,
     author = {E. A. Kozlova},
     title = {Damping problem for the hyperbolic equation with mixed derivative},
     journal = {Journal of Samara State Technical University, Ser. Physical and Mathematical Sciences},
     pages = {37--42},
     year = {2011},
     volume = {125},
     number = {4},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/VSGTU_2011_125_4_a4/}
}