@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/}
}