Geodesic
Hyperbolic bendings of surfaces
Matematičeskie zametki, Tome 10 (1971) no. 4, pp. 469-478.

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The paper investigates isolated singular points of the family of characteristics of a hyperbolic bending of a surface, as well as providing certain consequences characterizing the bending of closed surfaces and surfaces with boundaries. 
@article{MZM_1971_10_4_a11,
     author = {K. M. Belov},
     title = {Hyperbolic bendings of surfaces},
     journal = {Matemati\v{c}eskie zametki},
     pages = {469--478},
     publisher = {mathdoc},
     volume = {10},
     number = {4},
     year = {1971},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1971_10_4_a11/}
}
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K. M. Belov. Hyperbolic bendings of surfaces. Matematičeskie zametki, Tome 10 (1971) no. 4, pp. 469-478. http://geodesic.mathdoc.fr/item/MZM_1971_10_4_a11/