Geodesic
Integral Estimates of Lengths of Level Lines of Rational Functions and Zolotarev's Problem
Matematičeskie zametki, Tome 94 (2013) no. 3, pp. 331-337.

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Integral estimates of lengths of level lines (lemniscates) of rational functions of a complex variable are obtained. These estimates are related to the problem of separation of compact sets by rational functions and to Zolotarev's problem.
Keywords: integral estimate, rational function, separation of compact sets. 
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V. I. Danchenko. Integral Estimates of Lengths of Level Lines of Rational Functions and Zolotarev's Problem. Matematičeskie zametki, Tome 94 (2013) no. 3, pp. 331-337. http://geodesic.mathdoc.fr/item/MZM_2013_94_3_a1/

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