1. Collet P, Eckmann J P. Iterated Maps on the Interval as Dynamical Systems. Boston: Birkhauser, 1980
2. Beyer W A, Mauldin R D, Stein P R. Shift-maximal sequences in function itineration: existence, uniquencess and multiplicity. J Math Anal Appl, 1986, 115(6): 305–362
3. Mai J H. The integrity of kneading sequences in the family of unimodal maps. (in chinese), Acta Math, 1990, 33(2): 323–329
4. Mai J H, Zeng F P. Some families of unimodal maps without the integrity of kneading sequences. (in chinese), Sys Sci & Math Scis, 1995, 15(1): 1–9
5. Metroplis N, Stein M L, Stein P R. On finite limit sets for transformations on the interval. J Combin Theory(A), 1975, 15(2): 25–44