1. Generalized Ulam-von Neumann transformations. Ph.D. Thesis (1990), Graduate School of CUNY and UMI publication.
  2. Expanding direction of Period Doubling Operator (with T. Morita and D. Sullivan). Comm. in Math. Phys., 144 (1992), no. 3, 509-520.
  3. Dynamics of certain non-conformal semigroups. (Full Version IMS Preprint 92-5)  Complex Variables Theory Appl., 22 (1993), no. 1-2, 27-34.   
  4. Asymptotic differentiable structure on Cantor set. Comm. in Math. Phys., 155 (1993), no. 3, 503-509.
  5. Geometry of geometrically finite one-dimensional maps. Comm. in Math. Phys., 156 (1993), no. 3, 639-647.
  6. Towards topological classification of critically finite polynomials (with S. Hu). Proceedings of Conf. on Complex Analysis, 132-143, Internat. Press, 1994.
  7. Renormalization on one-dimensional folding maps. Dynamical Systems and Chaos, Vol. 1 (1995), 116-125.
  8. Markov partitions and Feigenbaum-like mappings. Comm. in Math. Phys., 171 (1995), no. 2, 351-363.
  9. On Ulam-von Neumann transformations. Comm. in Math. Phys., 172 (1995), no. 3, 449-459.