Author: Luedeman, John K.

Luedeman, John K.: Closure operations and semigroups of quotients. (English). Commentationes Mathematicae Universitatis Carolinae, vol. 20 (1979), issue 3, pp. 529-537
Luedeman, John K.; McMorris, F. R.; Sim, Soon Kiong: Semigroups for which every totally irreducible $S$-system is injective. (English). Commentationes Mathematicae Universitatis Carolinae, vol. 19 (1978), issue 1, pp. 27-35

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