Brownian Transition Functions and Random Walks on Certain Homogeneous Spaces Ramesh Gangolli Indiana University Mathematics Journal 1964 text pdf 10.1512/iumj.1964.13.13037 10.1512/iumj.1964.13.13037 en Indiana Univ. Math. J. 13 (1964) 603 - 615 state-of-the-art mathematics http://iumj.org/access/