Geodesic
On approximation of functions by singular integrals in the Hausdorff metric
Sbornik. Mathematics, Tome 63 (1989) no. 1, pp. 229-246 Cet article a éte moissonné depuis la source Math-Net.Ru

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Necessary and sufficient conditions are found for convergence in the Hausdorff metric of a sequence of integral operators on an arbitrary bounded measurable function. The criterion obtained is used to investigate summation of trigonometric Fourier series by the Abel–Poisson, Vallée-Poussin, Bernstein–Rogosinski, and Cesàro methods. Bibliography: 7 titles. 
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     title = {On approximation of functions by singular integrals in the {Hausdorff} metric},
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A. P. Petukhov. On approximation of functions by singular integrals in the Hausdorff metric. Sbornik. Mathematics, Tome 63 (1989) no. 1, pp. 229-246. http://geodesic.mathdoc.fr/item/SM_1989_63_1_a15/

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[7] Zigmund A., Trigonometricheskie ryady, Mir, M., 1965 | MR