@article{DE_1971_7_1_a19,
     author = {T. Sh. Kal'menov},
     title = {A criterion for the uniqueness of the solution of the {Darboux} problem for a certain degenerate hyperbolic equation},
     journal = {Differencialʹnye uravneni\^a},
     pages = {178--181},
     publisher = {mathdoc},
     volume = {7},
     number = {1},
     year = {1971},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1971_7_1_a19/}
}