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Author: Wiegandt, Richard

• Tumurbat, S.; Wiegandt, Richard: On $A$-radicals. (English). Mathematica Slovaca, vol. 56 (2006), issue 1, pp. 113-119
• Wiegandt, Richard: On the structure of lower radical semigroups. (English). Czechoslovak Mathematical Journal, vol. 22 (1972), issue 1, pp. 1-6