Figure 1From: A non-autonomous impulsive food-chain model with delaysPermanence of system with initial condition \(\phi _{1}(s)=x_{1}(0)=1.0\), \(\phi _{2}(s)=y_{1}(0)=2.5\), \(\phi _{3}(s)=z_{1}(0)=0.4\), \(s \in [-\tau ,0]\)Back to article page