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Gamal', Maria F.: On the shift index of contractions. Acta scientiarum mathematicarum, (78) 1-2. pp. 279-290. (2012)
Gamal', Maria F.: On power bounded operators that are quasiaffine transforms of singular unitaries. Acta scientiarum mathematicarum, (77) 3-4. pp. 589-606. (2011)
Gamal', Maria F.: On contractions that are quasiaffine transforms of unilateral shifts. Acta scientiarum mathematicarum, (74) 3-4. pp. 757-767. (2008)