[1] D. Kasthurirathna, M. Piraveenan, Scientific Reports 5(2015) , 10448.
[2] R Albert, A-L Barab´asi, Rev. Mod. Phys. 74 (2002) 47.
[3] S H Strogatz, Nature (London) 410 (2001) 268.
[4] R Pators-Satorras and A Vespignani, Phys. Rev. Lett. 86 (2001) 3200.
[5] M Bogu˜n´a, R. Pators-Satorras, Phys. Rev. E 66 (2002) 047104.
[6] M Boguna, R Pastor-Satorras, and A Vespignani, Phys. Rev. Lett. 90
(2003) 028701.
[7] R M May and A L Lloyd, Phys. Rev. E 64 (2002) 066112.
[8] A L Lloyd and R M May, Science 292 (2001) 1316.
[9] R. Isea1, Karl E. Lonngren, American Journal of Modern Physics and
Application 3(2) (2016) 11-15
[10] M Nekoveea, Y Moreno, G Bianconic, and M Marsili, Physica A 374
(2007) 457.
[11] I Percival, “Introduction to dynamics”, Cambridge University Press,
Cambridge (1982).
[12] S H Strogatz, “Nonlinear Dynamics and Chaos: With Applications To
Physics, Biology, Chemistry, and Engineering”, Westview Press (2001).