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   title       = {Han and Kamber: Data Mining---Concepts and Techniques, 2nd ed., Morgan Kaufmann, 2006}, 
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   biburl      = {https://puma.uni-kassel.de/url/7f046d667d25f6f53d413149bb40d258/stumme},
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@electronic{www.cse.ucsd.edu,
   title       = {Book}, 
   url         = {http://www.cse.ucsd.edu/users/dasgupta/mcgrawhill/},
   biburl      = {https://puma.uni-kassel.de/url/a26559878779be8ba0acd632c52471c3/stumme},
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