Chaotifiying continuous-time systems by symmetry
  In this letter we present a method of constructing dynamical systems with any preassigned number of equilibria by adding symmetry to another system with at least one equilibrium point. If the resulting system is chaotic, we call this procedure chaotification by symmetry since the resulting system is chaotic with many symmetrical equilibrium points. 
Zeraoulia Elhadj, J. C. Sprott
nlin.CD