@article{IVM_1971_2_a4,
     author = {R. M. Geidel'man},
     title = {On the projective theory of pairs of line congruences},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {42--52},
     publisher = {mathdoc},
     number = {2},
     year = {1971},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_1971_2_a4/}
}