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Retracts of monounary algebras corresponding to groupoids
Mathematica slovaca, Tome 56 (2006) no. 1, pp. 105-112
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Jakubíková-Studenovská, Danica. Retracts of monounary algebras corresponding to groupoids. Mathematica slovaca, Tome 56 (2006) no. 1, pp. 105-112. http://geodesic.mathdoc.fr/item/MASLO_2006_56_1_a8/

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