content_image/436421.jpg
<img src='content_image/436421.jpg'>

[1] S. H. Strogatz, Nature (London) 410 , 268 (2001). 

[2] S. Boccaletti, V. Latora, Y. Moreno, M. Chavez, and D. U. Hwang, Phys. Rep. 424 , 175 (2006). 

[3] A. Barrat, A. Vespignani, and M. Barthelemy, Dynamical Processes on Complex Networks (Cambridge University Press, Cambridge, UK, 2008). 

[4] S. N. Dorogovtsev, A. V. Goltsev, and J. F. F. Mendes, Rev. Mod. Phys. 80 , 1275 (2008). 

[5] R. Pastor-Satorras and A. Vespignani, Phys. Rev. Lett. 86 , 3200 (2001). 

[6] M. Barth´ elemy, A. Barrat, R. Pastor-Satorras, and A. Vespignani, J. Theor. Biol. 235 , 275 (2005). 

[7] K. T. D. Eames, Theor. Pop. Biol. 73 , 104 (2008). 

[8] M. Garavello and B. Piccoli, Traffic Flow on Networks (American Institute of Mathematical Sciences, Spring- field, MO, 2006). 

[9] A. Arenas, A. Diaz-Guilera, J. Kurths, Y. Moreno, and C. Zhou, Phys. Rep. 469 , 93 (2008). 

[10] M. E. J. Newman, Phys. Rev. E 68 , 026121 (2003). 

[11] M. A. Porter, J.-P. Onnela, and P. J. Mucha, Not. Amer. Math. Soc 9 , 1082 (2009). 

[12] M. E. J. Newman, Phys. Rev. Lett. 103 , 058701 (2009). 

[13] J. P. Gleeson, Phys. Rev. E 80 , 036107 (2009). 

[14] J. P. Gleeson and S. Melnik, Phys. Rev. E 80 , 046121 (2009). 

[15] M. Ostilli and J. F. F. Mendes, Phys. Rev. E 80 , 011142 (2009). 

[16] M. ´ A. Serrano and M. Bogu˜ n´ a, Phys. Rev. E 74 , 056114 (2006). [17] M. ´ A. Serrano and M. Bogu˜ n´ a, Phys. Rev. E 74 , 056115 

(2006). 

[18] M. ´ A. Serrano and M. Bogu˜ n´ a, Phys. Rev. Lett. 97 , 088701 (2006). 

[19] P. Trapman, Theor. Pop. Biol. 71 , 160 (2007). 

[20] J. C. Miller, J. Roy. Soc. Interface 6 , 1121 (2009). 

[21] J. C. Miller, Phys. Rev. E 80 , 020901 (2009). 

[22] T. Britton, M. Deijfen, A. N. Lager˙as, and M. Lindholm, J. Appl. Probab. 45 , 743 (2008). 

[23] M. E. J. Newman, SIAM Rev. 45 , 167 (2003). 

[24] A. L. Traud, E. D. Kelsic, P. J. Mucha, and M. A. Porter, arXiv (2008), 0809.0690. 

[25] The CAIDA Autonomous System Re- lationships Dataset, 30-Jun-2008 , URL 

[26] X. Guardiola, R. Guimera, A. Arenas, A. Diaz-Guilera, D. Streib, and L. A. N. Amaral, arXiv (2002), 0206240. 

[27] M. Bogu˜ n´ a, R. Pastor-Satorras, A. Diaz-Guilera, and A. Arenas, Phys. Rev. E 70 , 056122 (2004). 

[28] Giant component of the network of users of the Pretty-Good-Privacy algorithm for secure information interchange , URL http://deim.urv.cat/ ~ aarenas/data/xarxes/PGP.zip . 

[29] D. J. Watts and S. H. Strogatz, Nature (London) 393 , 440 (1998). 

