1. Albert, R., Jeong, H., Barabási, A.-L.: The Diameter of the World-Wide Web. Nature 401, 130–131 (1999)
2. Newman, M.E.J.: Scientific collaboration networks. I. Network construction and fundamental results. Phys. Rev. E 64, 0161311–0161318 (2001)
3. Albert, R., Barabási, A.-L.: Statistical mechanics of complex networks. Rev. Mod. Phys. 74, 47–97 (2002)
4. Dorogovtsev, S.N., Mendes, J.F.F.: Evolution of networks. Adv. Phys. 51, 1079–1187 (2002)
5. Bollobás, B., Riordan, O.: Mathematical results on scale-free random graphs. In: Handbook of Graphs and Networks, pp. 99–121. Wiley-VCH, Berlin (2002)