Geodesic
A note on the curvature of the level line under the conformal mapping
Vestnik Tomskogo gosudarstvennogo universiteta. Matematika i mehanika, no. 3 (2013), pp. 34-36

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A lower bound is established by a new method on the class $S$ for the curvature of level lines under conformal mapping.
Keywords: holomorphic univalent mapping, level line, curvature. 
@article{VTGU_2013_3_a3,
     author = {S. A. Copanev},
     title = {A note on the curvature of the level line under the conformal mapping},
     journal = {Vestnik Tomskogo gosudarstvennogo universiteta. Matematika i mehanika},
     pages = {34--36},
     publisher = {mathdoc},
     number = {3},
     year = {2013},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/VTGU_2013_3_a3/}
}
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S. A. Copanev. A note on the curvature of the level line under the conformal mapping. Vestnik Tomskogo gosudarstvennogo universiteta. Matematika i mehanika, no. 3 (2013), pp. 34-36. http://geodesic.mathdoc.fr/item/VTGU_2013_3_a3/