Geodesic
Polynomial approximation in the $L^p$-metric on disjoint segments
Zapiski Nauchnykh Seminarov POMI, Investigations on linear operators and function theory. Part 28, Tome 270 (2000), pp. 175-200 
N. Yu. Krasheninnikova; N. A. Shirokov. Polynomial approximation in the $L^p$-metric on disjoint segments. Zapiski Nauchnykh Seminarov POMI, Investigations on linear operators and function theory. Part 28, Tome 270 (2000), pp. 175-200. http://geodesic.mathdoc.fr/item/ZNSL_2000_270_a7/
@article{ZNSL_2000_270_a7,
     author = {N. Yu. Krasheninnikova and N. A. Shirokov},
     title = {Polynomial approximation in the $L^p$-metric on disjoint segments},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {175--200},
     year = {2000},
     volume = {270},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_2000_270_a7/}
}
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Voir la notice du chapitre de livre provenant de la source Math-Net.Ru

The function Sobolev class on the union of a finite number of disjoint segments is described in terms of the rate of polynomial approximation.