%0 Journal Article
%A M. Sh. Birman
%A M. Z. Solomyak
%T Piecewise-polynomial approximations of functions of the classes $W_p^\alpha$
%J Sbornik. Mathematics
%D 1967
%P 295-317
%V 2
%N 3
%I mathdoc
%U http://geodesic.mathdoc.fr/item/SM_1967_2_3_a2/
%G en
%F SM_1967_2_3_a2