Geodesic
Best piecewise-monotone approximation and the Banach indicatrix
Matematičeskie zametki, Tome 26 (1979) no. 1, pp. 77-87.

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     author = {E. A. Sevast'yanov},
     title = {Best piecewise-monotone approximation and the {Banach} indicatrix},
     journal = {Matemati\v{c}eskie zametki},
     pages = {77--87},
     publisher = {mathdoc},
     volume = {26},
     number = {1},
     year = {1979},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1979_26_1_a9/}
}
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E. A. Sevast'yanov. Best piecewise-monotone approximation and the Banach indicatrix. Matematičeskie zametki, Tome 26 (1979) no. 1, pp. 77-87. http://geodesic.mathdoc.fr/item/MZM_1979_26_1_a9/