Figure 4

The boundary equilibrium \(\pmb{E_{2}}\) is locally asymptotically stable with the parameters \(\pmb{a_{1}=1}\) , \(\pmb{a_{2}=1}\) , \(\pmb{b_{1}=2}\) , \(\pmb{b_{2}=2}\) , \(\pmb{c_{1}=1.2}\) , \(\pmb{d_{1}=1}\) , \(\pmb{d_{2}=1 }\) and \(\pmb{d_{3}=1}\) .