1. Y. Katznelson,An introduction to harmonic analysis, John Wiley (New York, 1968).
2. M. A. Krasnosel'skii andYa. B. Rutickii,Convex functions and Orlicz spaces, Noordhoff (Groningen, 1962).
3. V. Totik, Comparison of “uniform” and “almost everywhere” summability properties,Acta Acad. Sci. Math. Hungar.,39 (1982), 129–133.
4. A.Zygmund,Trigonometric series. I (Cambridge, 1959).