@article{IVM_1969_7_a7,
     author = {S. E. Karapetyan},
     title = {A~geometric meaning of conjugate directions of {a~Grassmann} manifold},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {59--64},
     publisher = {mathdoc},
     number = {7},
     year = {1969},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_1969_7_a7/}
}