Cauchy Integrals and Spectral Measures R. GoldsteinR. Saeks Indiana University Mathematics Journal 1973 text pdf 10.1512/iumj.1973.22.22030 10.1512/iumj.1973.22.22030 en Indiana Univ. Math. J. 22 (1973) 367 - 378 state-of-the-art mathematics http://iumj.org/access/