%0 Journal Article %A G. N. Kazimirov %T Direct and inverse theorems of approximation theory for the generalized modulus of smoothness of some class of functions %J Problemy fiziki, matematiki i tehniki %D 2021 %P 92-94 %N 4 %I mathdoc %U http://geodesic.mathdoc.fr/item/PFMT_2021_4_a14/ %G ru %F PFMT_2021_4_a14