@article{IM2_1969_3_2_a3,
     author = {V. R. Nosov},
     title = {On a mixed problem for a hyperbolic equation of the second order},
     journal = {Izvestiya. Mathematics },
     pages = {357--374},
     publisher = {mathdoc},
     volume = {3},
     number = {2},
     year = {1969},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/IM2_1969_3_2_a3/}
}