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Deák Attila; Nagy Attila: Finite permutable Putcha semigroups. In: Acta scientiarum mathematicarum, (76) 3-4. pp. 397-410. (2010)
Deák Attila: On a problem of A. Nagy concerning permutable semigroups satisfying a non-trivial permutation identity. In: Acta scientiarum mathematicarum, (72) 3-4. pp. 537-541. (2006)