@article{IVM_1971_4_a7,
     author = {G. N. Makeev and L. F. Stepanova},
     title = {$\theta$ pairs of two-parameter families of $(n-1)$-planes in~$P_{2n-1}$},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {59--68},
     publisher = {mathdoc},
     number = {4},
     year = {1971},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_1971_4_a7/}
}