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2. Finite rank butler groups: a survey of recent results;Arnold;Lect. Notes Pure Appl. Math.,1993
3. On a class of Butler groups;Fuchs;Manuscripta Math.,1991
4. Infinite Abelian Groups, vols. 1, 2;Fuchs,1970
5. Almost Completely Decomposable Abelian Groups;Mader,1999