Characterizations of dual semigroups
Chi Keung Lai, Kar-Ping Shum (1989)
Czechoslovak Mathematical Journal
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Chi Keung Lai, Kar-Ping Shum (1989)
Czechoslovak Mathematical Journal
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Štefan Schwarz (1971)
Czechoslovak Mathematical Journal
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Dorota Krajňáková (1970)
Matematický časopis
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