@article{IM2_1982_18_2_a0,
     author = {S. V. Konyagin},
     title = {On~a~problem of {Littlewood}},
     journal = {Izvestiya. Mathematics },
     pages = {205--225},
     publisher = {mathdoc},
     volume = {18},
     number = {2},
     year = {1982},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/IM2_1982_18_2_a0/}
}