Technological systems as that of Internet and WWW represent a paramount case of scale-free networks. They differ each other. Internet is the set of hosts like computers and routers connected by physical edges. WWW instead is the set of html documents connected by hyperlinks.

The acticty of our group is related to the study of the cycle structure in the Internet and the analysis of the WWW data.

— GuidoCaldarelli – 09 Nov 2005