On the projective theory of pairs of line congruences
Izvestiâ vysših učebnyh zavedenij. Matematika, no. 2 (1971), pp. 42-52.

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     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/}
}
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R. M. Geidel'man. On the projective theory of pairs of line congruences. Izvestiâ vysših učebnyh zavedenij. Matematika, no. 2 (1971), pp. 42-52. http://geodesic.mathdoc.fr/item/IVM_1971_2_a4/