1. Zygmund, A. Trigonometrical Series (Mir, Moscow, 1965), Vol. 1 [Russian translation].
2. Albiac, F., Kalton, N. J. Topics in Banach Space Theory, Graduate Texts in Mathematics 233 (Springer, New York, 2006).
3. Rudin, W. “Trigonometric SeriesWith Gaps”, J. Math.Mech. 9, 203–227 (1960).
4. Blei, R. Analysis in Integer and Fractional Dimensions, Cambridge Stud. in Advanced Math. 71 (Cambridge Univ. Press, Cambridge, UK, 2001).
5. Bourgain, J. “Bounded Orthogonal Systems and the Λ(p)-Set Problem”, ActaMath. 162, 227–245 (1989).