Geodesic
Polars and X-ideals in semigroups
Mathematica slovaca, Tome 26 (1976) no. 1, pp. 31-37.

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Classification : 06F15, 20M10 
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     title = {Polars and {X-ideals} in semigroups},
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Šmarda, Bohumil. Polars and X-ideals in semigroups. Mathematica slovaca, Tome 26 (1976) no. 1, pp. 31-37. http://geodesic.mathdoc.fr/item/MASLO_1976__26_1_a3/