http://www.amazon.com/Search-Patterns-Discovery-Peter-Morville/dp/0596802277/ref=sr_1_5?s=books&ie=UTF8&qid=1298576731&sr=1-5

http://www.amazon.com/Googles-PageRank-Beyond-Science-Rankings/dp/0691122024

http://www.wired.com/magazine/2010/02/ff_google_algorithm/3/

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