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Zorboska Nina: Closed range essentially normal composition operators are normal. In: Acta scientiarum mathematicarum, (65) 1-2. pp. 287-292. (1999)
Zorboska Nina: Hyponormal composition operators on weighted Hardy spaces. In: Acta scientiarum mathematicarum, (55) 3-4. pp. 399-402. (1991)