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@article{DE_1991_27_1_a16, author = {D. V. Tunitsky}, title = {Nonlinear hyperbolic systems with two independent variables}, journal = {Differencialʹnye uravneni\^a}, pages = {147--155}, publisher = {mathdoc}, volume = {27}, number = {1}, year = {1991}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DE_1991_27_1_a16/} }
D. V. Tunitsky. Nonlinear hyperbolic systems with two independent variables. Differencialʹnye uravneniâ, Tome 27 (1991) no. 1, pp. 147-155. http://geodesic.mathdoc.fr/item/DE_1991_27_1_a16/