@electronic{www.itp.uni-bremen.de,
   title       = {Complex Systems Lab - Stefan Bornholdt}, 
   url         = {http://www.itp.uni-bremen.de/complex/},
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@electronic{ebusiness.tc.msu.edu,
   title       = {3rd International Conference on Communities and Technologies - home}, 
   url         = {https://ebusiness.tc.msu.edu/cct2007/},
   biburl      = {https://puma.uni-kassel.de/url/ceffb3ba4e013b8a1ecb104f0ebc20b3/stumme},
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