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[3] Mutual information - Wikipedia <a href="http://en.wikipedia.org/wiki/Mutual_information">http://en.wikipedia.org/wiki/Mutual_information</a>
[4] Artificial Intelligence: A Modern Approach - S.Russel, P.Norvig <a href="http://www.amazon.com/Artificial-Intelligence-Modern-Approach-Edition/dp/0136042597">http://www.amazon.com/Artificial-Intelligence-Modern-Approach-Edition/dp/0136042597</