Sigurdur Helgason

Differential Geometry and Symmetric Spaces

The Radon Transform

Groups and geometric analysis

Integral Geometry and Radon Transforms

Groups and Geometric Analysis : Radon Transforms, Invariant Differential Operators and Spherical Functions

Differential Geometry, Lie Groups, and Symmetric Spaces

Differential Geometry and Symmetric Spaces (Pure & Applied Mathematics)

Global Differential Geometry and Global Analysis 1984