Subalgebra modular, distributive and boolean varieties of semigroups
Bedřich Pondělíček (1992)
Czechoslovak Mathematical Journal
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Bedřich Pondělíček (1992)
Czechoslovak Mathematical Journal
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Bedřich Pondělíček (1985)
Czechoslovak Mathematical Journal
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Radomír Halaš (1993)
Acta Universitatis Palackianae Olomucensis. Facultas Rerum Naturalium. Mathematica
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