Zipf's Law and the Internet.
Glottometrics, 3:143-150, 2002.
L. A. Adamic and B. A. Huberman.
[BibTeX] 

Zipf, Power-laws, and Pareto - a ranking tutorial .
http://www.hpl.hp.com/research/idl/papers/ranking/ranking.html. 2002.
Lada Adamic.
[doi]  [BibTeX]