The extrinsic curvature of convex surfaces in spaces of constant curvature
Izvestiâ vysših učebnyh zavedenij. Matematika, no. 1 (1960), pp. 58-68.

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@article{IVM_1960_1_a7,
     author = {A. L. Verner},
     title = {The extrinsic curvature of convex surfaces in spaces of constant curvature},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {58--68},
     publisher = {mathdoc},
     number = {1},
     year = {1960},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_1960_1_a7/}
}
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EP  - 68
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%T The extrinsic curvature of convex surfaces in spaces of constant curvature
%J Izvestiâ vysših učebnyh zavedenij. Matematika
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A. L. Verner. The extrinsic curvature of convex surfaces in spaces of constant curvature. Izvestiâ vysših učebnyh zavedenij. Matematika, no. 1 (1960), pp. 58-68. http://geodesic.mathdoc.fr/item/IVM_1960_1_a7/