On ideals of a semilattice
Mario Petrich (1972)
Czechoslovak Mathematical Journal
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Mario Petrich (1972)
Czechoslovak Mathematical Journal
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Thomas Bowman (1975)
Czechoslovak Mathematical Journal
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František Kmeť (1988)
Mathematica Slovaca
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C. S., Jr. Johnson, Frederick R. McMorris (1976)
Czechoslovak Mathematical Journal
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