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1. Google's explanation of its PageRank;
2. The ever-changing Wikipedia article on PageRank;
3. Phil Craven's article at WebWorkshop, explaining how PageRank works and introducing the concept of LinkFarms;
4. Matt Cutts' e-mail to SearchEngineJournal, where he confirms that the recent alteration of PageRank was due to paid links (lots of comments here);
5. And now, the blog commentary: Problogger, SearchEngineGuide, and
Entrepreneur's Journey.
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