Fractals and Self-Similarity John Hutchinson Indiana University Mathematics Journal 1981 text pdf 10.1512/iumj.1981.30.30055 10.1512/iumj.1981.30.30055 en Indiana Univ. Math. J. 30 (1981) 713 - 747 state-of-the-art mathematics http://iumj.org/access/