Geodesic
Projective classification of ruled surfaces, and focal transforms of a~surface
Izvestiâ vysših učebnyh zavedenij. Matematika, no. 12 (1974), pp. 51-53.

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@article{IVM_1974_12_a6,
     author = {R. M. Geidel'man},
     title = {Projective classification of ruled surfaces, and focal transforms of a~surface},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {51--53},
     publisher = {mathdoc},
     number = {12},
     year = {1974},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_1974_12_a6/}
}
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R. M. Geidel'man. Projective classification of ruled surfaces, and focal transforms of a~surface. Izvestiâ vysših učebnyh zavedenij. Matematika, no. 12 (1974), pp. 51-53. http://geodesic.mathdoc.fr/item/IVM_1974_12_a6/