@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/}
}