Geodesic
Torsion-free Abelian groups of rank~3
Sbornik. Mathematics, Tome 68 (1991) no. 1, pp. 1-17

Voir la notice de l'article provenant de la source Math-Net.Ru

Torsion-free Abelian groups similar in properties to torsion-free Abelian groups of rank 3, in particular the groups of rank 3 themselves, can be characterized up to quasi-isomorphism by means of certain invariants. From the invariants of each such group one can compute invariants of its pure subgroups and invariants of its factor-groups modulo its pure subgroups. Bibliography: 11 titles. 
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A. A. Fomin. Torsion-free Abelian groups of rank~3. Sbornik. Mathematics, Tome 68 (1991) no. 1, pp. 1-17. http://geodesic.mathdoc.fr/item/SM_1991_68_1_a0/