1. N.K. Bari (Bary). A treatise on trigonometric series, volume II. Pergamon,New York, 1964.
2. J. Beck. “flat” polynomials on the unit circle-on a problem of Little-wood.To appear.
3. S.N. Bernstein. Sur la convergence absolute des séries trigonométriques. C.R. Acad. Sci. Paris, pages 1661–1663,1914.
4. J.S. Byrnes. On polynomials with coefficients of modulus one. Bull. London Math. Soc., 9:171–176,1977.
5. P. Erdös. Some unsolved problems. Michigan Mathematical Journal 4:291–300,1957.