Fractional-order systems without equilibria: The first example of hyperchaos and its application to synchronization
Cafagna Donato†, Grassi Giuseppe
       
Poincare maps of the proposed fractional-order system without equilibrium points ( 16 ) when w = 0: (a) map in the 3D ( x , y , z )-space; (b) map in the 2D ( x , z )-plane.