Some new properties of surfaces of the second order in elliptic space
Izvestiâ vysših učebnyh zavedenij. Matematika, no. 1 (1959), pp. 136-144.

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     author = {Nguyen Khanh Toan},
     title = {Some new properties of surfaces of the second order in elliptic space},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {136--144},
     publisher = {mathdoc},
     number = {1},
     year = {1959},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_1959_1_a12/}
}
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Nguyen Khanh Toan. Some new properties of surfaces of the second order in elliptic space. Izvestiâ vysših učebnyh zavedenij. Matematika, no. 1 (1959), pp. 136-144. http://geodesic.mathdoc.fr/item/IVM_1959_1_a12/