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R. Baeza-Yates, B. Ribeiro-Neto. Modern Information Retrieval. Addison-Wesley, 2011.
Soumen Chakrabarti, Mining the Web: Discovering Knowledge from Hypertext Data, Morgan-Kaufmann Publishers, 2003, ISBN 1-55860-754-4
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Mark Levene, An Introduction to Search Engines and Web Navigation, Pearson Education, 2010, ISBN 0321306775