Über Strukturbedingungen für Fourierreihen.
On Some Inequalities of Series of Positive Terms.
A survey of certain results on strong approximation by orthogonal series
This is a survey of results in a particular direction of the theory of strong approximation by orthogonal series, related mostly with author's contributions to the subject.
Nicht verbesserbare Strukturbedingungen
An addition to factorization of inequalities.
A new extension of monotone sequences and its applications.
On integrability of functions defined by trigonometric series.
A recent note on the absolute Riesz summability factors.
On equivalence of coefficient conditions.
Newer applications of generalized monotone sequences.
Integrability conditions pertaining to Orlicz space.
A later note on the relationships of numerical sequences.
On relations of coefficient conditions.
On embedding of the class .
On equivalence of coefficient conditions. II.
Necessary and sufficient conditions for joint lower and upper estimates.
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