TY - JOUR AU - A. I. Stepanets TI - Sharp estimates of Fourier coefficients on classes of continuous and differentiable periodic functions of several variables JO - Doklady Akademii Nauk PY - 1981 SP - 34 EP - 38 VL - 261 IS - 1 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/DAN_1981_261_1_a7/ LA - ru ID - DAN_1981_261_1_a7 ER -