%0 Journal Article %A Hamza A. S. Abujabal %T Some commutativity properties for rings %J Novi Sad Journal of Mathematics %D 1992 %P 163-175 %V 22 %N 2 %I mathdoc %U http://geodesic.mathdoc.fr/item/NSJOM_1992_22_2a_13/ %F NSJOM_1992_22_2a_13