References:

1. A. F. Beardon, "Iteration of Rational Functions: Complex Analytic Dynamical Systems," Springer-Verlag, New York, 1991.

2. Pierre Fatou, "Sur les equations fonctionelles." Bulletin des le Societe Mathematique (France), #47, 161-271 (1919) and Bulletin des le Societe Mathematique (France), #48, 33-94, 208-314 (1920).

3. Gina Kolata, "Scientists at Work: Leonard Adleman; Hitting the High Spots of Computer Theory." The New York Times, Tuesday, December 13, 1994 page C1,C10.