1. [Br] Breiman, L.: Probabolity theory. Addison-Wesley 1968
2. [Co] Collet, P. Some ergodic properties of maps of the interval. In: Bamon R. et al.: Dynamical Systems and Frustrated Systems. (to appear)
3. [CG] Collet, P. and Galves, A.: Asymptotic distribution of entrance times for expanding maps of an interval. (Preprint 1992)
4. Ser. Stat.;D.J. Daley,1988
5. Grundlehren Math. Wiss.;W.F. Donoghue Jr.,1974