%0 Journal Article
%A N. N. Pustovoitov
%T Estimates of the~best approximations of periodic functions by trigonometric polynomials in terms of averaged differences and the~multidimensional Jackson's theorem
%J Sbornik. Mathematics
%D 1997
%P 1507-1520
%V 188
%N 10
%I mathdoc
%U http://geodesic.mathdoc.fr/item/SM_1997_188_10_a3/
%G en
%F SM_1997_188_10_a3