On a simple one-element extension of left zero semigroups
Commentationes Mathematicae Universitatis Carolinae, Tome 21 (1980) no. 2, pp. 313-318.

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Classification : 08A05, 08A30, 08A35, 08B15, 20L05, 20M07, 20M99
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Lee, Sin Min. On a simple one-element extension of left zero semigroups. Commentationes Mathematicae Universitatis Carolinae, Tome 21 (1980) no. 2, pp. 313-318. http://geodesic.mathdoc.fr/item/CMUC_1980__21_2_a9/