Geodesic
Same properties $r$-fold integration series on Fourier--Haar system
Izvestiya of Saratov University. Mathematics. Mechanics. Informatics, Tome 9 (2009) no. 1, pp. 68-76.

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Approximation properties of series obtained by $r$-fold integration of Fourier–Haar series are research. It is shown that $r$-fold integrated Fourier–Haar series can be useful in the task of simultaneous approximation of differentiable function and its derivatives. 
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I. I. Sharapudinov; G. N. Muratova. Same properties $r$-fold integration series on Fourier--Haar system. Izvestiya of Saratov University. Mathematics. Mechanics. Informatics, Tome 9 (2009) no. 1, pp. 68-76. http://geodesic.mathdoc.fr/item/ISU_2009_9_1_a8/

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