On the absolute Riesz summability factors.
Factorization of inequalities.
Power-monotone sequences and Fourier series with positive coefficients.
Notes to G. Bennett's problems.
A note on the absolute Riesz summability factors.
Additions to the Telyakovskiĭ's class .
On the utility of the Telyakovskiĭ's class .
Über unbedingte Konvergenz der Orthogonalreihen mit strukturellen Bedingungen
On the strong summability and approximation of Fourier series
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