TY - JOUR AU - S. V. Bochkarev TI - Multiplicative Bounds for $L_1$-Norms of Exponential Sums JO - Contemporary Mathematics. Fundamental Directions PY - 2007 SP - 49 EP - 57 VL - 25 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/CMFD_2007_25_a4/ LA - ru ID - CMFD_2007_25_a4 ER -