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@article{DE_1971_7_1_a5, author = {A. M. Nakhushev}, title = {The {Darboux} problem for degenerate hyperbolic equations}, journal = {Differencialʹnye uravneni\^a}, pages = {49--56}, publisher = {mathdoc}, volume = {7}, number = {1}, year = {1971}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DE_1971_7_1_a5/} }
A. M. Nakhushev. The Darboux problem for degenerate hyperbolic equations. Differencialʹnye uravneniâ, Tome 7 (1971) no. 1, pp. 49-56. http://geodesic.mathdoc.fr/item/DE_1971_7_1_a5/