@electronic{www.vanderwal.net,
   title       = {Folksonomy Presentation}, 
   url         = {http://www.vanderwal.net/essays/051130/folksonomy.pdf},
   biburl      = {https://puma.uni-kassel.de/url/8987028427e477d7e1c1a4430784d08e/stephandoerfel},
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@electronic{theory.stanford.edu,
   title       = {KMeans++ Presentation Slides}, 
   url         = {http://theory.stanford.edu/~sergei/slides/BATS-Means.pdf},
   biburl      = {https://puma.uni-kassel.de/url/9ac8fea67f41c243cdadf427a3353f12/stephandoerfel},
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