1. G. Szegö, “Über einen Satz des Hern Serge Bernstein”,Schrift. Königsberg. Gelehrten Gesellschaft.,5, No. 4, 59–70 (1928).
2. A. Zygmund,Trigonometric Series. Vols. 1, 2, Cambridge Univ. Press, Cambridge (1965).
3. V. V. Arestov, “On integral inequalities for trigonometric polynomials and their derivatives”,Izv. Akad. Nauk SSSR, Ser. Mat.,45, No. 1, 3–22 (1981).
4. L. V. Taikov, “On conjugate trigonometric polynomials”,Mat. Zametki,48, No. 4, 110–114 (1990).
5. R. Edwards,Fourier Series in Modern Interpretation [Russian translation]. Vols. 1, 2, Mir, Moscow (1985).