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. 2019 Jan 9;21(1):44. doi: 10.3390/e21010044

Figure 1.

Figure 1

(a) Bifurcation diagram with respect to the parameter k at (x1,0,x2,0,a,b,c)=(0.11,0.12,2,0.5,0.5); (b) time series for the system’s variables at (x1,0,x2,0,k,a,b,c)=(0.11,0.12,0.87,2,0.5,0.5); (c) the Lyapunov exponent with respect to the parameter k at (x1,0,x2,0,a,b,c)=(0.11,0.12,2,0.5,0.5); (d) chaotic behavior of the system at the parameters (x1,0,x2,0,k,a,b,c)=(0.11,0.12,0.87,2,0.5,0.5).