%0 Journal Article %A K. V. Runovski %T Trigonometric polynomial approximation, $K$-functionals and generalized moduli of smoothness %J Sbornik. Mathematics %D 2017 %P 237-254 %V 208 %N 2 %U http://geodesic.mathdoc.fr/item/SM_2017_208_2_a3/ %G en %F SM_2017_208_2_a3