1. Podlubny I 1999 Fractional Differential Equations (New York: Academic Press)
2. Mandelbort B B 1983 The Fractal Geometry of Nature (New York: Freeman)
3. Chen Y Q, Moore K L 2002 Nonlinear Dyn. 29 191
4. Catherine B, Jonathan R P 200 Syst. Control Lett. 41 167
5. Zhang H G, Zhao Y, Yu W, Yang D S 2008 Chin. Phys. B 17 4056