@electronic{www.ted.com,
   title       = {Luis von Ahn: Massive-scale online collaboration | Video on TED.com}, 
   url         = {http://www.ted.com/talks/luis_von_ahn_massive_scale_online_collaboration.html},
   biburl      = {https://puma.uni-kassel.de/url/c5d2db693e88034d92de351a245b672f/stumme},
   keywords    = {captcha cooperation mass online translation},
   added-at    = {2012-02-08T13:45:05.000+0100},
   description = {},
   interhash   = {c5d2db693e88034d92de351a245b672f}, 
   intrahash   = {c5d2db693e88034d92de351a245b672f}
}