Figure 1
From: PD control at Neimark–Sacker bifurcations in a Mackey–Glass system

The numerical solution of Eq. (2.11) with PD control Euler method corresponding to \(k_{p}=0.09,k_{d}=0.2\) when (a) \(\tau=2.5\), (b) \(\tau=3.5\)
Theory and Modern Applications
From: PD control at Neimark–Sacker bifurcations in a Mackey–Glass system
The numerical solution of Eq. (2.11) with PD control Euler method corresponding to \(k_{p}=0.09,k_{d}=0.2\) when (a) \(\tau=2.5\), (b) \(\tau=3.5\)