[8] L. Kocarev, U. Parlitz, Generalized synchronization, predictability, and equivalence of unidirection- ally coupled dynamical systems, Phys. Rev. Lett. 76 (1996) 1816–1819. [9] J.M. Gonzáles-Miranda, Synchronization and Control of Chaos, Imperial College Press, London, 2004. [10] I.G. Malkin, Theory of Stability of Motion, Gosudarstv. Izdat. Tehn.-teor. Lit., Moscow-Leningrad, 1952 (in Russian). [11] V.S. Anishchenko, A.G. Balanov, N.B. Janson, N.B. Igosheva, G.V. Bordyugov, Entrainment be- tween heart rate and weak noninvasive forcing, Int. J. Bifurcat. Chaos, 10 (2000) 2339–2348. [12] J. Simonet, M. Warden, E. Brun, Locking and Arnold tongues in an infinite-dimensional system: The nuclear magnetic resonance laser with delayed feedback, Phys. Rev. E 50 (1994) 3383–3391. [13] D.G. Aronson, R.P. McGehee, I.G. Kevrekidis, R. Aris, Entrainment regions for periodically forced oscillators, Phys. Rev. A 33 (1986) 2190–2192. [14] R. Mettin, U. Parlitz, W. Lauterborn, Bifurcation structure of the driven van der Pol oscillator, Int. J. Bifurcat. Chaos 3 (1993) 1529–1555. [15] T.Y. Li, J.A. Yorke, Period three implies chaos, The American Mathematical Monthly 82 (1975) 985–992. [16] F.R. Marotto, Snap-back repellers imply chaos in R $^{n}$, J. Math. Anal. Appl. 63 (1978) 199–223. [17] Y. Shi, G. Chen, Chaos of discrete dynamical systems in complete metric spaces, Chaos, Solitons & Fractals 22 (2004) 555–571. [18] Y. Shi, G. Chen, Discrete chaos in Banach spaces, Science in China, Ser. A: Mathematics 48 (2005) 222–238. [19] M.U. Akhmet, M.O. Fen, A. Kıvılcım, Li-Yorke chaos generation by SICNNs with chaotic/almost periodic postsynaptic currents, Neurocomputing 173 (2016) 580–594. [20] M. Akhmet, M.O. Fen, Extension of Lorenz unpredictability, Int. J. Bifurcat. Chaos 25 (2015) 1550126. [21] M. Akhmet, Z. Akhmetova, M.O. Fen, Chaos in economic models with exogenous shocks, Journal of Economic Behavior & Organization 106 (2014) 95–108. [22] M. Akhmet, Z. Akhmetova, M.O. Fen, Exogenous versus endogenous for chaotic business cycles, Discontinuity, Nonlinearity, and Complexity 5 (2016) 101–119. 18