Geodesic
Uniform approximation of curvature of smooth planar curves
Trudy Instituta matematiki i mehaniki, Trudy Instituta Matematiki i Mekhaniki UrO RAN, Tome 22 (2016) no. 4, pp. 254-256

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We estimate the error of curvature approximation for graphs of functions from the class $W^r$ for $r \geqslant 3$ in the uniform metric.
Keywords: curvature approximation, planar curves. 
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     author = {Yu. N. Subbotin and S. A. Telyakovskii},
     title = {Uniform approximation of curvature of smooth planar curves},
     journal = {Trudy Instituta matematiki i mehaniki},
     pages = {254--256},
     publisher = {mathdoc},
     volume = {22},
     number = {4},
     year = {2016},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TIMM_2016_22_4_a23/}
}
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Yu. N. Subbotin; S. A. Telyakovskii. Uniform approximation of curvature of smooth planar curves. Trudy Instituta matematiki i mehaniki, Trudy Instituta Matematiki i Mekhaniki UrO RAN, Tome 22 (2016) no. 4, pp. 254-256. http://geodesic.mathdoc.fr/item/TIMM_2016_22_4_a23/