1. Lie Groups and Lie Algebras. Chapters 4–6. Elements of Mathematics;Bourbaki,2002
2. Functions, flows and oscillatory integrals on flag manifolds and conjugacy classes in real semisimple Lie groups;Duistermaat;Compos. Math.,1983
3. The product formula for the spherical functions on symmetric spaces of noncompact type;Graczyk;J. Lie Theory,2003
4. On the kernel of the product formula on symmetric spaces;Graczyk;J. Geom. Anal.,2004
5. P. Graczyk, P. Sawyer, A sharp criterion for the existence of the product formula on symmetric spaces of type An, preprint, 2009