Sub-Bergman Hilbert spaces on the unit disk Kehe Zhu Indiana University Mathematics Journal 1996 text pdf 10.1512/iumj.1996.45.1097 10.1512/iumj.1996.45.1097 en Indiana Univ. Math. J. 45 (1996) 165 - 176 state-of-the-art mathematics http://iumj.org/access/