Stability of Kleinian Groups F. GardinerI. Kra Indiana University Mathematics Journal 1972 text pdf 10.1512/iumj.1972.21.21084 10.1512/iumj.1972.21.21084 en Indiana Univ. Math. J. 21 (1972) 1037 - 1059 state-of-the-art mathematics http://iumj.org/access/