On Necessary and Sufficient Conditions for $ L^ P $ Estimates of Riesz Transforms Associated Elliptic Operators on $ R^ N $ and Related Estimates
Maximal Inequalities and Riesz Transform Estimates on $L^p$ Spaces for Schrödinger Operators with Nonnegative Potentials
On Necessary and Sufficient Conditions for $L^p$-Estimates of Riesz Transforms Associated to Elliptic Operators on $\mathbb {R}^n$ and Related Estimates