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@article{IVM_1967_11_a6, author = {L. Z. Kruglyakov}, title = {Semi-focal 2-families of straight lines in $P_5$}, journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika}, pages = {35--42}, publisher = {mathdoc}, number = {11}, year = {1967}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/IVM_1967_11_a6/} }
L. Z. Kruglyakov. Semi-focal 2-families of straight lines in $P_5$. Izvestiâ vysših učebnyh zavedenij. Matematika, no. 11 (1967), pp. 35-42. http://geodesic.mathdoc.fr/item/IVM_1967_11_a6/