Geodesic
Direct and inverse theorems on approximation by piecewise polynomial functions
Fundamentalʹnaâ i prikladnaâ matematika, Tome 18 (2013) no. 5, pp. 129-144
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The paper is concerned with some characteristics of approximation by piecewise polynomial functions with nonfixed knots in various integral metrics $L_p[a,b]$, $0$. 
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A. S. Kochurov. Direct and inverse theorems on approximation by piecewise polynomial functions. Fundamentalʹnaâ i prikladnaâ matematika, Tome 18 (2013) no. 5, pp. 129-144. http://geodesic.mathdoc.fr/item/FPM_2013_18_5_a6/

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