TY - JOUR AU - Anthony W. Hager AU - James J. Madden TI - Algebraic Classes of Abelian Torsion-Free and Lattice-Ordered Groups JO - Ευκλείδης Γ PY - 1990 SP - 53 EP - 63 VL - 25 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/EUG_1990__25_a3/ LA - gr ID - EUG_1990__25_a3 ER -