1. J. P. Kahane and R. Salem, Ensembles parfaits et séries trigonométriques, Hermann, Paris, 1963.
2. H. L. Royden, Real Analysis, 2nd ed., Macmillan, New York, 1968.
3. W. Rudin, Principles of Mathematical Analysis, 2nd ed., McGraw-Hill, New York, 1964.
4. A. Zygmund, Trigonometric Series, vol. 1, 3rd ed., Cambridge University Press, London, 1968.