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Approximation properties of Fejér- and de la Valleé-Poussin-type means for partial sums of a special series in the system \(\{\sin x\sin kx\}_{k=1}^\infty\). (English. Russian original) Zbl 1376.42039

Sb. Math. 206, No. 4, 600-617 (2015); translation from Mat. Sb. 206, No. 4, 131-148 (2015).
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