%0 Journal Article %A A. S. Shvedov %T Coconvex approximation of functions of several variables by polynomials %J Sbornik. Mathematics %D 1982 %P 515-526 %V 43 %N 4 %I mathdoc %U http://geodesic.mathdoc.fr/item/SM_1982_43_4_a4/ %G en %F SM_1982_43_4_a4