[1] Watts D J and Strogatz S H 1998 Nature 391 440

[2] Barabasi A L and Albet R 1999 Science 286 509

[3] Wang X F and Chen G 2002 Int. J. Bifur. Chaos 12 187

[4] Wang X F and Chen G 2002 IEEE Trans. Circuits Syst. I
49 54

[5] L\"{u J H and Chen G 2005 IEEE Trans. Auto. Control.
50 841

[6] Zhou J, Lu J A and L\"{u J H 2006 IEEE Trans.
Auto. Control 51 652

[7] Pecora L M and Carroll T C 1990 Phys. Rev. Lett.
64 821

[8] Pecora L M and Carroll T C 1991 Phys. Rev. A 44
2374

[9] Pecora L M and Carroll T C 1998 Phys. Rev. Lett.
80 2109

[10] Yang J and Hu G 1998 Phys. Rev. Lett. 80 496