Geodesic
$r$-systems of unary algebras. I: On maximal and greatest $J$-classes of the direct product of unary algebras
Mathematica slovaca, Tome 44 (1994) no. 1, pp. 55-68
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Abrhan, Imrich; Satko, Ladislav. $r$-systems of unary algebras. I: On maximal and greatest $J$-classes of the direct product of unary algebras. Mathematica slovaca, Tome 44 (1994) no. 1, pp. 55-68. http://geodesic.mathdoc.fr/item/MASLO_1994_44_1_a5/

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