5Belov A S. On sequential estimate of best approximation and moduli of continuity by sums of trigonometric series with quasimonotone coefficients (in Russian). Matem Zemetki, 51:132-134 (1992)
6Le R J, Zhou S P. A new condition for the uniform convergence of certain trigonometric series. Acta Math Hung, 108:161-169 (2005)
7Leindler L. On the uniform convergence and boundedness of a certain class of sine series. Anal Math, 27: 279-285 (2001)
8Yu D S, Zhou S P. A generalization of monotone condition and applications. Acta Math Hung, 115: 247-267 (2007)
9Zhou S P. What strong monotonicity condition on Fourier coefficients can make the ratio ||f-Sn(f)||/En (f) bounded? Proc Amer Math Soc, 121:779-785 (1994)
10Zhou S P, Zhou P, Yu D S. The ultimate condition to generalize monotonicity for uniform convergence of trigonometric series, arXiv: math.CA/0611805 v1, November 27, 2006, preprint
