Semigroups with n-closed subsets.
I.L. Mel'nichuk (1989)
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I.L. Mel'nichuk (1989)
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V.P. Schneider (1982)
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T. Budak (1993)
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E. D. DeVun (1980)
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R.R. Zapatrin (1993)
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F. Catino, F. Migliorini (1992)
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D.W. Miller (1982)
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H.T. Murof (1989)
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B.D. Doytchinov, W.J. Hrusa, S.J. Watson (1997)
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F. Knowles (1974)
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