Composition operators on vector-valued Hardy spaces. S. D. Sharma; U. Bhanu — 1999 Extracta Mathematicae
Compact composition operators and Carleson measure in the upper half-plane. S. D. Sharma; Romesh Kumar — 2000 Extracta Mathematicae
Compact composition operators on Hardy-orlicz spaces Ajay K. Sharma; S. D. Sharma — 2008 Matematički Vesnik