On Radicals of Semigroups

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2. Joseph E. Kuczkowski, On Radicals in a Certain Class of Semigroups
3. Tibor Šalát, Štefan Znám, Correction to our paper 'On the average order of an arithmetical function'
4. Robert Šulka, On the Nilpotency in Semigroups
5. Bedřich Pondělíček, A Note on Radicals of Semigroups
6. Harbans Lal, Radicals in Quasi-Commutative Semigroups
7. František Kmeť, On radicals of the semigroup of triangular matrices
8. Harbans Lal, The Regular Ideal in a Semigroup
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