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@article{IVM_1983_8_a12, author = {O. M. Teut}, title = {A linear problem for a~system of hyperbolic type in a~characteristic quadrangle}, journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika}, pages = {64--73}, publisher = {mathdoc}, number = {8}, year = {1983}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/IVM_1983_8_a12/} }
O. M. Teut. A linear problem for a~system of hyperbolic type in a~characteristic quadrangle. Izvestiâ vysših učebnyh zavedenij. Matematika, no. 8 (1983), pp. 64-73. http://geodesic.mathdoc.fr/item/IVM_1983_8_a12/