TY - JOUR AU - È. M. Galeev TI - Kolmogorov widths of classes of periodic functions of one and several variables JO - Izvestiya. Mathematics PY - 1991 SP - 435 EP - 448 VL - 36 IS - 2 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/IM2_1991_36_2_a10/ LA - en ID - IM2_1991_36_2_a10 ER -