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• Goeters, H. Pat; Ullery, William: Butler groups and lattices of types. (English). Commentationes Mathematicae Universitatis Carolinae, vol. 31 (1990), issue 4, pp. 613-619
• O'Neill, John D.: On summands of direct products of Abelian groups. (English). Commentationes Mathematicae Universitatis Carolinae, vol. 24 (1983), issue 3, pp. 407-413