1-5 of 5 Books

Uniqueness and Non-Uniqueness of Semigroups Generated by Singular Diffusion Operators
By Andreas Eberle

On Necessary and Sufficient Conditions for L^p-estimates of Riesz Transforms Associated to Elliptic Operators on R^n and Related Estimates (Memoirs of the American Mathematical Society)
By Pascal Auscher

Representations of commutative semitopological semigroups
By Charles F. Dunkl

The algebraic theory of semigroups
By A. H. Clifford,G. B. Preston