%0 Journal Article %A È. M. Galeev %T Order estimates of smallest norms, with respect to the choice of $N$ harmonics, of derivatives of the Dirichlet and Favard kernels %J Sbornik. Mathematics %D 1992 %P 567-578 %V 72 %N 2 %I mathdoc %U http://geodesic.mathdoc.fr/item/SM_1992_72_2_a16/ %G en %F SM_1992_72_2_a16