%0 Journal Article %A Mecheri, Salah %T Commutants and derivation ranges %J Czechoslovak Mathematical Journal %D 1999 %P 843-847 %V 49 %N 4 %I mathdoc %U http://geodesic.mathdoc.fr/item/CMJ_1999__49_4_a15/ %G en %F CMJ_1999__49_4_a15