On stability, persistence and Hopf bifurcation of fractional order   dynamical system
  This is a preliminary study for bifurcation in fractional order dynamical systems. Stability, persistence and hopf bifurcation are studied. Some studies are also done for functional equations. 
Hala El-Saka, E. Ahmed, M. I. Shehata and A. M. A. -El-Sayed