TY - JOUR AU - L. V. Taikov TI - The best approximations in $L_2(0,2\pi)$ of classes of periodic functions with derivatives of bounded variation JO - Matematičeskie zametki PY - 1980 SP - 239 EP - 242 VL - 28 IS - 2 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/MZM_1980_28_2_a4/ LA - ru ID - MZM_1980_28_2_a4 ER -