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Bifurcation diagrams of the steady states of x1,s of the model (4) as a function of parameter β for s = 2.8, k = 0.1 (a) and k = 0.3 (b); Numerical integration of the equations of the model (4) for s = 2.8, β = 0.35 and k = 0.1 (c) and k = 0.3 (d).
