%0 Journal Article %A Ondřej F. K. Kalenda %T (I)-envelopes of unit balls and James' characterization of reflexivity %J Studia Mathematica %D 2007 %P 29-40 %V 182 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.4064/sm182-1-2/ %R 10.4064/sm182-1-2 %G en %F 10_4064_sm182_1_2