1. D. Arnold, Pure subgroups of finite rank completely decomposable groups, Lecture Notes in Math. 874, Springer, New York, 1981, pp. 1–31.
2. D. Arnold, “Finite Rank Abelian Groups and Rings”, Lecture Notes in Math. 931, Springer, New York, 1982. -
3. D. Arnold and M. Dugas, Representations of finite posets and near isomorphism of finite rank Butler groups, Rocky Mountain J. Math., to appear.
4. D. Arnold and C. Vinsonhaler, Finite rank Butler groups; a survey of recent results, Lecture Notes in Pure and Appl. Math. 146, Marcel Dekker, New York, 1993, pp. 17–42.
5. D. Arnold and C. Vinsonhaler, Pure subgroups of finite rank completely decomposable groups II, Lecture Notes in Math. 1006, Springer, New York, 1983, pp. 97–143.