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
Lopez, Antonio M., Jr.; Luedeman, John K.: Quasi-injective $S$-systems and their $S$-endomorphism semigroup. (English). Czechoslovak Mathematical Journal, vol. 29 (1979), issue 1, pp. 97-104
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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