Geodesic
On the Extrinsic Curvature and the Extrinsic Structure of Normal Developable $C^1$ Surfaces
Matematičeskie zametki, Tome 87 (2010) no. 6, pp. 900-906

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It is proved that any normal $C^1$ surface developable in the sense of Shefel has zero extrinsic curvature in the sense of Pogorelov. A condition under which such a surface has a standard line of striction is obtained.
Keywords: normal developable surface, extrinsic curvature, line of striction, conical surface, cylindrical surface, torsial surface. 
@article{MZM_2010_87_6_a10,
     author = {I. Kh. Sabitov},
     title = {On the {Extrinsic} {Curvature} and the {Extrinsic} {Structure} of {Normal} {Developable} $C^1$ {Surfaces}},
     journal = {Matemati\v{c}eskie zametki},
     pages = {900--906},
     publisher = {mathdoc},
     volume = {87},
     number = {6},
     year = {2010},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_2010_87_6_a10/}
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I. Kh. Sabitov. On the Extrinsic Curvature and the Extrinsic Structure of Normal Developable $C^1$ Surfaces. Matematičeskie zametki, Tome 87 (2010) no. 6, pp. 900-906. http://geodesic.mathdoc.fr/item/MZM_2010_87_6_a10/