1. Aspenberg, M., Yampolsky, M.: Mating non-renormalizable quadratic polynomials. arXiv:math.DS/0610343
2. Bing, R.H.: The Kline sphere characterization problem. Bull. Am. Math. Soc. 52, 644–653 (1946)
3. Kuratowski, K.: Topology. San Diego, Academic/PWN Press (1966). Revised edition
4. LMS Lecture Note Series;T. Lei,2000
5. Luo, J.: Combinatorics and Holomorphic Dynamics: Captures, Matings and Newton’s Method. PhD Thesis, Cornell University (1995)