Figure 2From: Periodic solution and control optimization of a prey-predator model with two types of harvestingPhase diagram of system ( 5 ) with \(\pmb{a=4}\), \(\pmb{K=8}\), \(\pmb{b=0.6}\), \(\pmb{\lambda=0.5}\), \(\pmb{d=0.2}\), \(\pmb{H=1.8}\).Back to article page