[23] Grebogi, C. & Yorke, J. A. [1997] The Impact of Chaos on Science and Society , (United Nations University Press, Tokyo). [24] Guirao, J. L. G. & Lampart, M. [2005] “Li and Yorke chaos with respect to the cardinality of the scrambled sets,” Chaos, Solitons and Fractals $_{24}$, 1203–1206. [25] Hale, J. & Koçak, H. [1991] Dynamics and Bifurcations , (Springer-Verlag, New York). [26] Hilger, S. [1988] “Ein Maßkettenkalkül mit Anwendung auf Zentrumsmanningfaltigkeiten,” PhD thesis , Universität Würzburg. [27] Horn, R. A. & Johnson, C. R. [1992] Matrix Analysis , (Cambridge University Press, United States of America). [28] Kloeden, P. & Li, Z. [2006] “Li-Yorke chaos in higher dimensions: a review,” Journal of Difference Equations and Applications $_{12}$, 247–269. [29] Kolyada, S. F. [2004] “Li-Yorke sensitivity and other concepts of chaos,” Ukrainian Mathematical Journal $_{56}$, 1242–1257. [30] Kuchta, M. & Smítal, J. [1989] “Two point scrambled set implies chaos,” European Conference on Iteration Theory (ECIT 87) , (World Sci. Publishing, Singapore), pp. 427–430. [31] Lakshmikantham, V., Sivasundaram, S. & Kaymakcalan, B. [1996] Dynamic Systems on Measure Chains , (Kluwer Academic Publishers, Netherlands). [32] Lakshmikantham, V. & Vatsala, A. S. [2002] “Hybrid systems on time scales,” J. Comput. Appl. Math. $_{141}$, 227–235. [33] Lakshmikantham, V. & Devi, J. V. [2006] “Hybrid systems with time scales and impulses,” Nonlinear Analysis $_{65}$, 2147–2152. [34] Levinson, N. [1949] “A second order differential equation with singular solutions,” Ann. of Math. $_{50}$, 127–153. [35] Li, T. Y. & Yorke, J. A. [1975] “Period three implies chaos,” Amer. Math. Monthly $_{87}$, 985–992. [36] Li, S. [1993] “$_{ω}$-chaos and topological entropy,” Transactions of the American Mathematical Society $_{339}$, 243–249. [37] Li, P., Li, Z., Halang, W.A. & Chen, G. [2007] “Li-Yorke chaos in a spatiotemporal chaotic system,” Chaos, Solitons and Fractals $_{33}$, 335–341. [38] Lorenz, E. N. [1963] “Deterministic nonperiodic flow,” J. Atmos. Sci. $_{20}$, 130–141. 15