Geodesic
On the curvatures of tangent spheres
Trudy Matematicheskogo Instituta imeni V.A. Steklova, Discrete geometry and topology, Tome 196 (1991), pp. 90-92.

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@article{TM_1991_196_a7,
     author = {M. D. Kovalev},
     title = {On the curvatures of tangent spheres},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
     pages = {90--92},
     publisher = {mathdoc},
     volume = {196},
     year = {1991},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TM_1991_196_a7/}
}
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M. D. Kovalev. On the curvatures of tangent spheres. Trudy Matematicheskogo Instituta imeni V.A. Steklova, Discrete geometry and topology, Tome 196 (1991), pp. 90-92. http://geodesic.mathdoc.fr/item/TM_1991_196_a7/