%0 Journal Article %A R. Z. Dautov %T Direct and inverse theorems for the approximation of functions by algebraic polynomials and splines in the norms of the Sobolev space %J Izvestiâ vysših učebnyh zavedenij. Matematika %D 2022 %P 79-86 %N 6 %I mathdoc %U http://geodesic.mathdoc.fr/item/IVM_2022_6_a7/ %G ru %F IVM_2022_6_a7