@article{IVM_1975_7_a12,
     author = {M. V. Brazevich and E. T. Ivlev},
     title = {Pairs of ruled manifolds in three-dimensional projective space},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {103--106},
     publisher = {mathdoc},
     number = {7},
     year = {1975},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_1975_7_a12/}
}