On Persistence and Stability of some Biological Systems with Cross   Diffusion
  The concept of cross diffusion is applied to some biological systems. The conditions for persistence and Turing instability in the presence of cross diffusion are derived. Many examples including: predator-prey, epidemics (with and without delay), hawk-dove-retaliate and prisoner's dilemma games are given. 
E. Ahmed, A. S. Hegazi and A. S. Elgazzar