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Bergman, G. M.: Commuting elements in free algebras and related topics in ring theory. Thesis, Harvard University 1967.
Bourbaki, N.: Algèbre commutative, ch. 2. Paris: Hermann 1962.
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Cohn, P. M. Bound modules over hereditary rings. To appear in a memorial volume for A. I. Malcev.
To Helmut Wielandt, on his sixtieth birthday, 19 December, 1970