%0 Journal Article %A B. Wehrfritz %T The upper central series of some matrix groups %J Fundamenta Mathematicae %D 1990 %P 111-126 %V 135 %N 2 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.4064/fm-135-2-111-126/ %R 10.4064/fm-135-2-111-126 %G en %F 10_4064_fm_135_2_111_126