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42A05 Trigonometric polynomials, inequalities, extremal problems (5 articles)

• Zhu, Lai-Yi; Zhou, Da-Peng: On the proof of Erdős' inequality. (English). Czechoslovak Mathematical Journal, vol. 67 (2017), issue 4, pp. 967-979
• Krasniqi, Xhevat Z.: Some new modified cosine sums and $L^{1}$-convergence of cosine trigonometric series. (English). Archivum Mathematicum, vol. 49 (2013), issue 1, pp. 43-50
• Alzer, Horst: An inequality for the coefficients of a cosine polynomial. (English). Commentationes Mathematicae Universitatis Carolinae, vol. 36 (1995), issue 3, pp. 427-428
• Williams, Kenneth S.; Nan-Yue, Zhang: Evaluation of two trigonometric sums. (English). Mathematica Slovaca, vol. 44 (1994), issue 5, pp. 575-583
• van der Poorten, A. J.: On the distribution of zeros of exponential polynomials. (English). Mathematica Slovaca, vol. 26 (1976), issue 4, pp. 299-307