@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},
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@electronic{complexevents.com,
   title       = {Complex Event Processing}, 
   url         = {http://complexevents.com/},
   biburl      = {https://puma.uni-kassel.de/url/36c982331e5af56cf712ad6904f13421/benz},
   keywords    = {cep complex event processing},
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@electronic{scholar.google.de,
   title       = {complex networks theory - Google Scholar}, 
   url         = {http://scholar.google.de/scholar?q=complex+networks+theory&hl=de&um=1&ie=UTF-8&oi=scholart},
   biburl      = {https://puma.uni-kassel.de/url/c387229ad164b57ac9e153169bc9c634/stumme},
   keywords    = {complex networks sna theory},
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@electronic{www.tagora-project.eu,
   title       = {Social Websites - Complex Dynamics and Structure}, 
   url         = {http://www.tagora-project.eu/outreach/eccs07},
   biburl      = {https://puma.uni-kassel.de/url/0654c32ea17bfdd7e3f686e7c69a8d89/hotho},
   keywords    = {2007 complex dynamics social structure workshop},
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