Figure 6From: Bogdanov–Takens bifurcation of a Holling IV prey–predator model with constant-effort harvestingWhen \((\mu _{1}, \mu _{2})=(0.01,0.001)\) lies in region VI, a stable focus \(E_{1}^{*}\) is surrounded by an unstable limit cycle, which is circled by a stable cycleBack to article page