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@article{IVM_1990_3_a15, author = {O. A. Sdvizhkov}, title = {Homotopy classes of curves in the flag plane}, journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika}, pages = {83--84}, publisher = {mathdoc}, number = {3}, year = {1990}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/IVM_1990_3_a15/} }
O. A. Sdvizhkov. Homotopy classes of curves in the flag plane. Izvestiâ vysših učebnyh zavedenij. Matematika, no. 3 (1990), pp. 83-84. http://geodesic.mathdoc.fr/item/IVM_1990_3_a15/