1. Lectures on Elliptic Boundary Problems;Agmon,1965
2. Estimates near the boundary for solutions of elliptic partial differential equations satisfying general boundary conditions I, II;Agmon;Comm. Pure Appl. Math.,1959
3. Bounds for fundamental solutions of a parabolic equation;Aronson;Bull. Amer. Math. Soc.,1967
4. Regularity theorems and heat kernels for elliptic operators;Auscher;J. London Math. Soc.,1996
5. Square root problem for divergence operators and related topics;Auscher;Astérisque,1998