Broder, A., Kumar, R., Maghoul, F., Raghavan, P., Rajagopalan, S., Stata, R., Tomkins, A. & Wiener, J. (2000). Graph structure in the web. Computer Networks, 33, 309--320.

Chakrabarti, S., Dom, B., Gibson, D., Kleinberg, J., Raghavan, P. & Rajagopalan, S. (1998). Automatic resource compilation by analyzing hyperlink structure and associated text. Proceedings of the 7th World-wide web conference (WWW7),30(1-7) (p./pp. 65--74), .