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@article{MZM_1998_64_3_a15, author = {A. A. Karatsuba}, title = {An estimate of the $L_1$-norm of an exponential sum}, journal = {Matemati\v{c}eskie zametki}, pages = {465--468}, publisher = {mathdoc}, volume = {64}, number = {3}, year = {1998}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/MZM_1998_64_3_a15/} }
A. A. Karatsuba. An estimate of the $L_1$-norm of an exponential sum. Matematičeskie zametki, Tome 64 (1998) no. 3, pp. 465-468. http://geodesic.mathdoc.fr/item/MZM_1998_64_3_a15/