@electronic{www.iisocialcom.org,
   title       = {SocialCom 2009, August 29-31, Vancouver, Canada}, 
   url         = {http://www.iisocialcom.org/conference/socialcom2009/index.html},
   biburl      = {https://puma.uni-kassel.de/url/7aaf4667e219708515265736096dfdd8/benz},
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@electronic{www.cs.cmu.edu,
   title       = {Luis von Ahn's Home Page}, 
   url         = {http://www.cs.cmu.edu/~biglou/},
   biburl      = {https://puma.uni-kassel.de/url/75b631fb5122f9ee14047ae56ba43980/benz},
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@electronic{www.iisocialcom.org,
   title       = {Home - SocialCom-10}, 
   url         = {http://www.iisocialcom.org/conference/socialcom2010/},
   biburl      = {https://puma.uni-kassel.de/url/a51c187931c18b33dc2f39203e250abd/benz},
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@electronic{www.cs.cmu.edu,
   title       = {Christos Faloutsos: Homepage}, 
   url         = {http://www.cs.cmu.edu/~christos/},
   biburl      = {https://puma.uni-kassel.de/url/43fea1f6e292310356fa6ca16e6d9399/benz},
   keywords    = {www2009 social_computation graph_mining},
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