1. Bary, N.K.: A Treatise on Trigonometric series, I and II. MacMillan, New York (1964)
2. Belinsky, E., Liflyand, E., Trigub, R.: The Banach algebra A
∗ and its properties. J. Fourier Anal. Appl. 3, 103–129 (1997)
3. Dyachkov, A.M.: Asymptotics of singular integrals and differential properties of functions. Deposited at VINITI 7383-B86, 52 p. (1986) (Russian)
4. Hahn, H.: Über Fejérs Summierung der Fourierschen Reihe. Jahresbericht der D. M. V. 25, 359–366 (1916)
5. Hardy, G.H.: Divergent Series. Clarendon Press, Oxford (1949)