@article{RM_1971_26_4_a9,
     author = {A. S. Kalashnikov},
     title = {Second order linear degenerate hyperbolic equations with an infinite dependence domain},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
     publisher = {mathdoc},
     volume = {26},
     number = {4},
     year = {1971},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/RM_1971_26_4_a9/}
}