Geodesic
Approximation of periodic functions by Fejér suns
Izvestiya. Mathematics, Tome 5 (1971) no. 1, pp. 86-96 Cet article a éte moissonné depuis la source Math-Net.Ru

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In this work we give an expression for the principal term of deviation of periodic functions belonging to the space $L_p$, $1\leqslant p\leqslant\infty$, from their Fejér sums. 
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G. K. Lebed'; A. A. Avdeenko. Approximation of periodic functions by Fejér suns. Izvestiya. Mathematics, Tome 5 (1971) no. 1, pp. 86-96. http://geodesic.mathdoc.fr/item/IM2_1971_5_1_a6/

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