Geodesic
The $L_1$-Norm of a~Trigonometric Sum
Matematičeskie zametki, Tome 76 (2004) no. 1, pp. 133-143

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We obtain estimates of the trigonometric sum $S_N(\alpha)=\sum_{n=1}^N\varepsilon(n)\exp(2\pi i\alpha n)$. 
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     author = {K. M. Eminyan},
     title = {The $L_1${-Norm} of {a~Trigonometric} {Sum}},
     journal = {Matemati\v{c}eskie zametki},
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     year = {2004},
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     url = {http://geodesic.mathdoc.fr/item/MZM_2004_76_1_a12/}
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K. M. Eminyan. The $L_1$-Norm of a~Trigonometric Sum. Matematičeskie zametki, Tome 76 (2004) no. 1, pp. 133-143. http://geodesic.mathdoc.fr/item/MZM_2004_76_1_a12/