TY - JOUR AU - A. G. Babenko TI - Jackson's inequality for mean-square approximations of periodic functions by trigonometric polynomials on a uniform grid JO - Matematičeskie zametki PY - 1988 SP - 460 EP - 473 VL - 43 IS - 4 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/MZM_1988_43_4_a3/ LA - ru ID - MZM_1988_43_4_a3 ER -