@electronic{sourceforge.net,
   title       = {RapidMiner -- Data Mining, ETL, OLAP, BI - Browse Files at SourceForge.net}, 
   url         = {http://sourceforge.net/projects/rapidminer/files/},
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@electronic{mechanize.rubyforge.org,
   title       = {mechanize-2.0.1 Documentation}, 
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@electronic{snap.stanford.edu,
   title       = {Stanford Large Network Dataset Collection}, 
   url         = {http://snap.stanford.edu/data/index.html},
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@electronic{sourceforge.net,
   title       = {PGF and TikZ Source and Manual}, 
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@electronic{iospress.metapress.com,
   title       = {Fundamenta Informaticae}, 
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