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Tomáš Kepka (1979)
Acta Universitatis Carolinae. Mathematica et Physica
K. Golema-Hartman (1976)
Colloquium Mathematicae
Jaroslav Ježek, Tomáš Kepka (1984)
Czechoslovak Mathematical Journal
J.M. Barja, F.G. G-Rodeja (1980)
Semigroup forum