Periodic orbits in the hyperchaotic Chen system
  In this work, we show that a zero--Hopf bifurcation take place in the Hyperchaotic Chen system as parameters vary. Using averaging theory, we prove the existence of two periodic orbits bifurcating from the zero--Hopf equilibria located at the origin of the Hyperchaotic Chen system. 
Susanna Maza
math.DS nlin.CD