The Structure of Intertwining Isometries Richard CareyJoel Pincus Indiana University Mathematics Journal 1973 text pdf 10.1512/iumj.1973.22.22056 10.1512/iumj.1973.22.22056 en Indiana Univ. Math. J. 22 (1973) 679 - 703 state-of-the-art mathematics http://iumj.org/access/