TY - JOUR AU - S. B. Vakarchuk AU - V. I. Zabutnaya TI - Jackson--Stechkin Type Inequalities for Special Moduli of Continuity and Widths of Function Classes in the Space~$L_2$ JO - Matematičeskie zametki PY - 2012 SP - 497 EP - 514 VL - 92 IS - 4 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/MZM_2012_92_4_a1/ LA - ru ID - MZM_2012_92_4_a1 ER -