1. Genera and decompositions of torsion-free modules;Arnold,1976
2. Finite Rank Torsion-Free Abelian Groups and Rings;Arnold,1982
3. Butler groups, representations of finite posets, and modules over multiple pullback rings;Arnold,1993
4. D. Arnold and M. Dugas, Butler groups with finite typesets and free groups with distinguished subgroups, Forum Math., to appear.
5. D. Arnold and M. Dugas, Representations of finite posets and near-isomorphism of finite rank Butler groups, Preprint.