Simple extensions of the Lotka-Volterra prey-predator model (Q1670959)

The paper introduces several extended versions of the classical Lotka-Volterra prey-predator model, described by systems of ordinary differential equations; for example, the following model is considered \[ \dot{u}=u[\alpha-c_1uz+(c_2-\beta)vz-c_3uvz^2] \] \[ \dot{v}=v[-\gamma+c_2vz-(c_1-\delta)uz-c_3uvz^2] \] \[ \dot{z}=z^2[c_1u-c_2v+c_3uvz^2]. \]