%0 Journal Article %A Adam Osękowski %T On the UMD constant of the space $\ell _1^N$ %J Colloquium Mathematicum %D 2016 %P 135-147 %V 142 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.4064/cm142-1-7/ %R 10.4064/cm142-1-7 %G en %F 10_4064_cm142_1_7