16A26
- : Direct finiteness of group rings - a simple proof of the Kaplansky's conjecture for finite groups. (English). Commentationes Mathematicae Universitatis Carolinae, vol. 31 (1990), issue 3, pp. 427-429
- : The coefficient ring of the skew group ring. (English). Czechoslovak Mathematical Journal, vol. 29 (1979), issue 1, pp. 144-147
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