@article{MZM_1991_49_2_a17,
     author = {S. V. Konyagin},
     title = {A~problem of {Littlewood}},
     journal = {Matemati\v{c}eskie zametki},
     pages = {143--144},
     publisher = {mathdoc},
     volume = {49},
     number = {2},
     year = {1991},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1991_49_2_a17/}
}