%0 Journal Article %A R. M. S. Mahmud %T On commuting elemts of groups acting on trees %J Revista colombiana de matematicas %D 1993 %P 293-301 %V 27 %N 1-2 %I mathdoc %U http://geodesic.mathdoc.fr/item/RCM_1993__27_1-2_181891/ %F RCM_1993__27_1-2_181891