An extension of the theory of completely decomposable torsion-free abelian groups

Fred Richman
1983 Transactions of the American Mathematical Society  
We construct a class of strongly indecomposable finite rank torsion-free groups that includes the rank-one groups, and develop a complete set of invariants for them and their direct sums.
doi:10.1090/s0002-9947-1983-0704608-x fatcat:mttwpbvdcbcanbwa67llbtdshm