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@article{DE_1972_8_1_a10, author = {M. Meredov}, title = {The {Darboux} problem for a degenerate hyperbolic system}, journal = {Differencialʹnye uravneni\^a}, pages = {97--106}, publisher = {mathdoc}, volume = {8}, number = {1}, year = {1972}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DE_1972_8_1_a10/} }
M. Meredov. The Darboux problem for a degenerate hyperbolic system. Differencialʹnye uravneniâ, Tome 8 (1972) no. 1, pp. 97-106. http://geodesic.mathdoc.fr/item/DE_1972_8_1_a10/