@electronic{www-faculty.cs.uiuc.edu,
   title       = {Han and Kamber: Data Mining---Concepts and Techniques, 2nd ed., Morgan Kaufmann, 2006}, 
   url         = {http://www-faculty.cs.uiuc.edu/~hanj/bk2/slidesindex.html},
   biburl      = {https://puma.uni-kassel.de/url/7f046d667d25f6f53d413149bb40d258/hotho},
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@electronic{www.fyslab.hut.fi,
   title       = {Sergey Dorogovtsev}, 
   url         = {http://www.fyslab.hut.fi/~sdo/},
   biburl      = {https://puma.uni-kassel.de/url/ab2817fb6eb1a7ad0b4a7b99b288c717/hotho},
   keywords    = {free graphtheory to:bibtex toread book networks sna},
   added-at    = {2006-09-11T16:36:25.000+0200},
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