%0 Journal Article %A S. M. Lytkin %T Expansion over a system of shifts of pyramidal functions with a square base %J Vestnik Moskovskogo universiteta. Matematika, mehanika %D 2014 %P 3-7 %N 3 %I mathdoc %U http://geodesic.mathdoc.fr/item/VMUMM_2014_3_a0/ %G ru %F VMUMM_2014_3_a0