More recently, Mukherjee and his colleagues (Choudhury et al., 2006;Mukherjee et al., 2007;Mukherjee et al., 2008) studied this problem in the framework of complex networks.
note that spectral analysis, however, has been successfully employed in the domains of biological and social networks (Farkas et al., 2001;Gkantsidis et al., 2003;Banerjee and Jost, 2007).