%0 Journal Article
%A P. E. Parvanov
%T A Characterization of Best Multivariate Algebraic Approximations from Below and from Above in Terms of K-Functionals
%J Mathematica balkanica
%D 1997
%P 37
%V 11
%N 1-2
%I mathdoc
%U http://geodesic.mathdoc.fr/item/MABA_1997_11_1-2_a4/
%F MABA_1997_11_1-2_a4