Geodesic
Transformations of surfaces by focal families of rays.
Izvestiâ vysših učebnyh zavedenij. Matematika, no. 6 (1962), pp. 3-13.

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@article{IVM_1962_6_a0,
     author = {M. A. Akivis},
     title = {Transformations of surfaces by focal families of rays.},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {3--13},
     publisher = {mathdoc},
     number = {6},
     year = {1962},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_1962_6_a0/}
}
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M. A. Akivis. Transformations of surfaces by focal families of rays.. Izvestiâ vysših učebnyh zavedenij. Matematika, no. 6 (1962), pp. 3-13. http://geodesic.mathdoc.fr/item/IVM_1962_6_a0/