Geodesic
On the transformation of triorthogonal quadratic systems in four-dimensional non-Euclidean spaces
Izvestiâ vysših učebnyh zavedenij. Matematika, no. 2 (1965), pp. 45-57 
R. M. Geidel'man. On the transformation of triorthogonal quadratic systems in four-dimensional non-Euclidean spaces. Izvestiâ vysših učebnyh zavedenij. Matematika, no. 2 (1965), pp. 45-57. http://geodesic.mathdoc.fr/item/IVM_1965_2_a5/
@article{IVM_1965_2_a5,
     author = {R. M. Geidel'man},
     title = {On the transformation of triorthogonal quadratic systems in four-dimensional {non-Euclidean} spaces},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {45--57},
     year = {1965},
     number = {2},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_1965_2_a5/}
}
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EP  - 57
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%G ru
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