@article{MZM_2014_96_3_a12,
     author = {M. N. Feller},
     title = {Boundary-Value {Problems} for a {Nonlinear} {Hyperbolic} {Equation} with {Variable} {Coefficients} and the {L\'evy} {Laplacian}},
     journal = {Matemati\v{c}eskie zametki},
     pages = {440--449},
     publisher = {mathdoc},
     volume = {96},
     number = {3},
     year = {2014},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_2014_96_3_a12/}
}