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   title       = {Speech and Language Processing}, 
   url         = {http://www.cs.colorado.edu/~martin/slp.html},
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   title       = {Foundations of Statistical Natural Language Processing}, 
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   title       = {Introduction to Information Retrieval}, 
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   title       = {Han and Kamber: Data Mining---Concepts and Techniques, 2nd ed., Morgan Kaufmann, 2006}, 
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