H. Sharma, A. Sikora, Vertical maximal functions on manifolds with ends. Journal of Evolution Equations 24, 49, 31p, 2024.  Preprint on arXiv https://arxiv.org/abs/2303.17721. 

J. van Neerven, P. Portal, H. Sharma, Spectral multiplier theorems for abstract harmonic oscillators on UMD lattices. Comptes Rendus Mathematique, Acad. Sci. Paris 361, 835--846, 2023. Preprint on arXiv https://arxiv.org/abs/2201.03082.

H. Sharma, Bounds on the Phillips calculus of abstract first order differential operators. Results in Mathematics, 76(4):187, 2021. Preprint on arXiv https://arxiv.org/abs/2012.10041.

Spectral multiplier theorems for abstract differential operators (supervised by A/Prof. Pierre Portal). PhD. Thesis, 2022.

Semigroups of composition operators (supervised by Prof. Sachi Srivastava). MPhil Thesis, 2017.