1. R. Salem, Essais sur les séries trigonométriques (Hermann et Cie., Paris, 1940).
2. H. K. Bari, Trigonometric Series (Fizmatgiz, Moscow, 1961) [in Russian].
3. S. A. Telyakovskii, “On the behavior of sine series near zero,” Makedon. Acad. Nauk. Umet. Oddel. Mat.-Tehn. Nauk. Prilozi 21 (1-2), 47–54 (2000).
4. A. Yu. Popov and A. P. Solodov, “Estimates with sharp constants of the sums of sine series with monotone coefficients of certain classes in terms of the Salem majorant,” Math. Notes 104 (5), 702–711 (2018).
5. A. Yu. Popov, “Refinement of estimates of sums of sine series with monotone coefficients and cosine series with convex coefficients,” Math. Notes 109 (5), 808–818 (2021).