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. 2021 Mar 4;82(4):28. doi: 10.1007/s00285-021-01550-0

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© The Author(s) 2021

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Fig. 22 — LPA bifurcation diagram for the combined model (CM) with respect to the parameter s. Other parameters as in Table 4 (CM2). There are many apparent branches of periodic solutions. In a parameter range around $s = 20$ , there are no stable equilibria nor stable periodic solutions even though the system remains bounded, which suggests the presence of chaos