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Author: Satko, Ladislav

• Abrhan, Imrich; Satko, Ladislav: $r$-systems of unary algebras. I: On maximal and greatest $J$-classes of the direct product of unary algebras. (English). Mathematica Slovaca, vol. 44 (1994), issue 1, pp. 55-68
• Abrhan, Imrich; Satko, Ladislav: $r$-systems of unary algebras. II: Maximal and minimal subalgebras of the direct products of unary algebras. (English). Mathematica Slovaca, vol. 44 (1994), issue 1, pp. 69-83
• Satko, Ladislav: The tensor product of groupoids. (English). Mathematica Slovaca, vol. 44 (1994), issue 2, pp. 237-244