1. N. K. Bary,A Treatise on Trigonometric Series, Vol. 1, Macmillan, New York, 1964.
2. C. C. Graham,Compact independent sets and Haar measure, Proc. Amer. Math. Soc. (to appear).
3. H. Helson,Fourier transforms on perfect sets, Studia Math.14 (1954), 209–213.
4. E. Hewitt and K. Ross,Abstract Harmonic Analysis II, Springer-Verlag, New York, 1970.
5. J. P. Kahane R. Salem,Ensembles Parfaits et Séries Trigonométriques, Hermann, Paris, 1963.