Preprint Dec 1994. J. London Math. Uniformly elliptic operators with measurable coefficients. Preprint April 1995. J Functional Anal.
Heat kernel bounds for higher order elliptic operators.
Preprint June 1995. St. Jeans Conference Proceedings to appear. Sharp bounds on heat kernels of higher order uniformly elliptic operators. Preprint June 1995. Spectral theory and differential operators.