1. Li T Y and Yorke J A, Period three implies chaos, Amer. Math. Monthly, 1975, 82: 985–992.
2. Piórek J, On the generic chaos in dynamical systems, Univ. Iagel. Acta Math., 1985, 25: 293–298.
3. Snoha L, Generic chaos, Comment. Math. Univ. Carolin., 1990, 31: 793–810.
4. Snoha L, Dense chaos, Comment. Math. Univ. Carolin., 1992, 33: 747–752.
5. Devaney R L, An Introduction to Chaotic Dynamical Systems, Addison-Wesley 1989.