TY - JOUR AU - V. I. Ivanov AU - D. V. Gorbachev AU - Yu. D. Rudomazina TI - Some extremal problems for periodic functions with conditions on their values and Fourier coefficients JO - Trudy Instituta matematiki i mehaniki PY - 2005 SP - 92 EP - 111 VL - 11 IS - 2 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/TIMM_2005_11_2_a7/ LA - ru ID - TIMM_2005_11_2_a7 ER -