@article{TM_1997_218_a4,
     author = {S. V. Bochkarev},
     title = {On a~method for estimating the $L_1$-norm of an exponential sum},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
     pages = {74--76},
     publisher = {mathdoc},
     volume = {218},
     year = {1997},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TM_1997_218_a4/}
}