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Semigroup Forum > 2011 > 83 > 3 > 412-446
Monatshefte für Mathematik > 2004 > 141 > 4 > 315-322
Applied Categorical Structures > 2003 > 11 > 2 > 147-155
Acta Mathematica Hungarica > 2002 > 95 > 1-2 > 75-95
Theoretical Computer Science > 2001 > 250 > 1-2 > 365-391
Czechoslovak Mathematical Journal > 2001 > 51 > 2 > 415-432