%0 Journal Article %A O. M. Martynov %T On the Relative Projection Constants of Certain Classes of Subspaces of $l_\infty^{2n}$ %J Funkcionalʹnyj analiz i ego priloženiâ %D 2020 %P 98-101 %V 54 %N 4 %I mathdoc %U http://geodesic.mathdoc.fr/item/FAA_2020_54_4_a7/ %G ru %F FAA_2020_54_4_a7