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@article{IVM_1981_9_a19, author = {O. M. Teut}, title = {A~problem for a~system of mixed-composite type in a~characteristic quadrangle}, journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika}, pages = {81--84}, publisher = {mathdoc}, number = {9}, year = {1981}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/IVM_1981_9_a19/} }
O. M. Teut. A~problem for a~system of mixed-composite type in a~characteristic quadrangle. Izvestiâ vysših učebnyh zavedenij. Matematika, no. 9 (1981), pp. 81-84. http://geodesic.mathdoc.fr/item/IVM_1981_9_a19/