Representation of Free Herglotz Functions James PascoeBenjamin PasserRyan Tully-Doyle Indiana University Mathematics Journal 2019 text pdf 10.1512/iumj.2019.68.7730 10.1512/iumj.2019.68.7730 en Indiana Univ. Math. J. 68 (2019) 1199 - 1215 state-of-the-art mathematics http://iumj.org/access/