%0 Journal Article %A Jackett, David R. %T The nil-degree of a torsion-free Abelian group %J Commentationes Mathematicae Universitatis Carolinae %D 1980 %P 393-406 %V 21 %N 2 %I mathdoc %U http://geodesic.mathdoc.fr/item/CMUC_1980__21_2_a17/ %G en %F CMUC_1980__21_2_a17