%0 Journal Article %A Anthony W. Hager %A James J. Madden %T Algebraic Classes of Abelian Torsion-Free and Lattice-Ordered Groups %J Ευκλείδης Γ %D 1990 %P 53-63 %V 25 %I mathdoc %U http://geodesic.mathdoc.fr/item/EUG_1990__25_a3/ %G gr %F EUG_1990__25_a3