%0 Journal Article %A Ton, Dao-Rong %T Free $\ell $-groups and free products of $\ell $-groups %J Commentationes Mathematicae Universitatis Carolinae %D 1994 %P 617-625 %V 35 %N 4 %I mathdoc %U http://geodesic.mathdoc.fr/item/CMUC_1994__35_4_a2/ %G en %F CMUC_1994__35_4_a2