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@article{DE_1972_8_1_a7, author = {V. V. Kovrizhkin}, title = {Weak solutions of the {Darboux} problem}, journal = {Differencialʹnye uravneni\^a}, pages = {68--75}, publisher = {mathdoc}, volume = {8}, number = {1}, year = {1972}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DE_1972_8_1_a7/} }
V. V. Kovrizhkin. Weak solutions of the Darboux problem. Differencialʹnye uravneniâ, Tome 8 (1972) no. 1, pp. 68-75. http://geodesic.mathdoc.fr/item/DE_1972_8_1_a7/