On -lattices
Alfonz Haviar (1979)
Mathematica Slovaca
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Alfonz Haviar (1979)
Mathematica Slovaca
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Ján Jakubík (1981)
Mathematica Slovaca
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Ján Jakubík (1980)
Czechoslovak Mathematical Journal
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Ivan Chajda (1992)
Acta Universitatis Palackianae Olomucensis. Facultas Rerum Naturalium. Mathematica
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