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@article{IVM_1971_1_a4, author = {E. T. Ivlev}, title = {Certain geometric forms associated with a~family of lines and planes in $^lS_n$}, journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika}, pages = {35--44}, publisher = {mathdoc}, number = {1}, year = {1971}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/IVM_1971_1_a4/} }
E. T. Ivlev. Certain geometric forms associated with a~family of lines and planes in $^lS_n$. Izvestiâ vysših učebnyh zavedenij. Matematika, no. 1 (1971), pp. 35-44. http://geodesic.mathdoc.fr/item/IVM_1971_1_a4/