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Paszkiewicz Adam: On a unitary operator with pathological ergodic means. In: Acta scientiarum mathematicarum, (71) 3-4. pp. 741-749. (2005)
Paszkiewicz Adam: A new proof of the Rademacher- Menshov Theorem. In: Acta scientiarum mathematicarum, (71) 3-4. pp. 631-642. (2005)