Geodesic
Polynomial approximation of functions defined on a~finite interval of the~real line
Fundamentalʹnaâ i prikladnaâ matematika, Tome 6 (2000) no. 3, pp. 859-871.

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The paper contains some results concerning interrelation between generalized modules of smoothness of functions and their best approximation by algebraic polynomials. 
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     author = {M. K. Potapov},
     title = {Polynomial approximation of functions defined on a~finite interval of the~real line},
     journal = {Fundamentalʹna\^a i prikladna\^a matematika},
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     publisher = {mathdoc},
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     year = {2000},
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M. K. Potapov. Polynomial approximation of functions defined on a~finite interval of the~real line. Fundamentalʹnaâ i prikladnaâ matematika, Tome 6 (2000) no. 3, pp. 859-871. http://geodesic.mathdoc.fr/item/FPM_2000_6_3_a15/