%0 Journal Article %A Roman Drnovšek %T Once more on positive commutators %J Studia Mathematica %D 2012 %P 241-245 %V 211 %N 3 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.4064/sm211-3-5/ %R 10.4064/sm211-3-5 %G en %F 10_4064_sm211_3_5