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   title       = {Freebase}, 
   url         = {http://www.freebase.com/},
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   title       = {Zipf, Power-law, Pareto - a ranking tutorial}, 
   url         = {http://www.hpl.hp.com/research/idl/papers/ranking/ranking.html},
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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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