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• Kelarev, A. V.: On the Jacobson radical of strongly group graded rings. (English). Commentationes Mathematicae Universitatis Carolinae, vol. 35 (1994), issue 3, pp. 575-580
• Kelarev, A. V.: On the Jacobson radical of graded rings. (English). Commentationes Mathematicae Universitatis Carolinae, vol. 33 (1992), issue 1, pp. 21-24