%0 Journal Article %A K.Tukhliev %T Best approximations and widths of some classes of convolutions in $L_{2}$ %J Trudy Instituta matematiki i mehaniki %D 2016 %P 284-294 %V 22 %N 4 %I mathdoc %U http://geodesic.mathdoc.fr/item/TIMM_2016_22_4_a26/ %G ru %F TIMM_2016_22_4_a26