$L^p$ Boundedness of the Riesz transform related to Schrödinger operators on a manifold

Badr, Nadine; Ben Ali, Besma

Annali della Scuola Normale Superiore di Pisa - Classe di Scienze, Volume 8 (2009) p. 725-765

Maximal inequalities and Riesz transform estimates on $L^p$ spaces for Schrödinger operators with nonnegative potentials

Auscher, Pascal; Ben Ali, Besma

Annales de l'Institut Fourier, Volume 57 (2007) p. 1975-2013