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Komal B. S.; Gupta Dharmendra K.: Normal composition operators. In: Acta scientiarum mathematicarum, (47) 3-4. pp. 445-448. (1984)
Gupta Dharmendra K.; Komal B. S.: Characterizations and invariant subspaces of composition operators. In: Acta scientiarum mathematicarum, (46). pp. 283-286. (1983)
Singh Raj Kishor; Gupta Dharmendra K.; Kumar Ashok: Compact and Hilbert-Schmidt composition operators on weighted sequence spaces. In: Acta scientiarum mathematicarum, (43) 1-2. pp. 117-122. (1981)