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   title       = {Kurs: Internet Suchmaschinen 2010}, 
   url         = {https://moodle.uni-kassel.de/moodle/course/view.php?id=4367},
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@electronic{www.kde.cs.uni-kassel.de,
   title       = {Home: Internet-Suchmaschinen 2010}, 
   url         = {http://www.kde.cs.uni-kassel.de/lehre/ss2010/IR},
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@electronic{nlp.stanford.edu,
   title       = {Introduction to Information Retrieval}, 
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@electronic{www.cs.utexas.edu,
   title       = {CS 371R: Information Retrieval and Web Search}, 
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@electronic{irthoughts.wordpress.com,
   title       = {IR Thoughts}, 
   url         = {http://irthoughts.wordpress.com/},
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