%0 Journal Article %A Jin-Hsien Wang %A Pei Wu %T Sums of square-zero operators %J Studia Mathematica %D 1991 %P 115-127 %V 99 %N 2 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.4064/sm-99-2-115-127/ %R 10.4064/sm-99-2-115-127 %G en %F 10_4064_sm_99_2_115_127