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16A56 

• Conrad, Paul F.: The hulls of semiprime rings. (English). Czechoslovak Mathematical Journal, vol. 28 (1978), issue 1, pp. 59-86
• Cornish, William H.: Amalgamating commutative regular rings. (English). Commentationes Mathematicae Universitatis Carolinae, vol. 18 (1977), issue 3, pp. 423-436