@electronic{opencorporates.com,
   title       = {OpenCorporates | How complex are corporate structures?}, 
   url         = {https://opencorporates.com/viz/financial/},
   biburl      = {https://puma.uni-kassel.de/url/4cda135e0c92ab037411924ae9db515e/hotho},
   keywords    = {complex corporate network structures visualization},
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@electronic{iccs09.hse.ru,
   title       = {International Conference on Conceptual Ctructures 2009}, 
   url         = {http://iccs09.hse.ru/index.html},
   biburl      = {https://puma.uni-kassel.de/url/90646b6d12b54884a8edbbf68b37b5bb/hotho},
   keywords    = {2009 conceptual conference iccs pc structures},
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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},
   keywords    = {free download graphs data book structures algorithms},
   added-at    = {2006-09-07T15:56:22.000+0200},
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