%0 Journal Article %A Ton, Dao-Rong %T The Galois connection between weak torsion and sub-product classes of $l$-groups %J Mathematica slovaca %D 1997 %P 511-516 %V 47 %N 5 %I mathdoc %U http://geodesic.mathdoc.fr/item/MASLO_1997__47_5_a2/ %G en %F MASLO_1997__47_5_a2