Geodesic
Determination of the enveloping lines of contact of mutually enveloped surfaces
Izvestiâ vysših učebnyh zavedenij. Matematika, no. 10 (1975), pp. 47-50.

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@article{IVM_1975_10_a4,
     author = {F. L. Litvin},
     title = {Determination of the enveloping lines of contact of mutually enveloped surfaces},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {47--50},
     publisher = {mathdoc},
     number = {10},
     year = {1975},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_1975_10_a4/}
}
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F. L. Litvin. Determination of the enveloping lines of contact of mutually enveloped surfaces. Izvestiâ vysših učebnyh zavedenij. Matematika, no. 10 (1975), pp. 47-50. http://geodesic.mathdoc.fr/item/IVM_1975_10_a4/