TY - JOUR AU - S. B. Vakarchuk TI - On Estimates in~$L_2(\mathbb{R})$ of Mean $\nu$-Widths of Classes of Functions Defined via the Generalized Modulus of Continuity of~$\omega_{\mathcal{M}}$ JO - Matematičeskie zametki PY - 2019 SP - 198 EP - 211 VL - 106 IS - 2 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/MZM_2019_106_2_a3/ LA - ru ID - MZM_2019_106_2_a3 ER -