@electronic{www.heise.de,
   title       = {c't 25/2007, S. 148: Web 2.0: Ökonomie}, 
   url         = {http://www.heise.de/ct/07/25/148/},
   biburl      = {https://puma.uni-kassel.de/url/48653369758d9e270f98c1ae88b2e893/hotho},
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@electronic{www.roboternetz.de,
   title       = {RoboterNetz.de :: Thema anzeigen - Wie teuer kommt CT Roboter?}, 
   url         = {http://www.roboternetz.de/phpBB2/printview.php?t=20154&start=0},
   biburl      = {https://puma.uni-kassel.de/url/33996b81afddb1ddab3cc4ce21e31096/hotho},
   keywords    = {teile bot ct},
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@electronic{www.segor.de,
   title       = {Segor-electronics GmbH}, 
   url         = {http://www.segor.de/},
   biburl      = {https://puma.uni-kassel.de/url/59b23323f0249a006aa173aa49e1e92e/hotho},
   keywords    = {bot ct hardware},
   added-at    = {2007-01-03T13:37:24.000+0100},
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@electronic{www.heise.de,
   title       = {c't Projekte - c't-Bot und c't-Sim}, 
   url         = {http://www.heise.de/ct/ftp/projekte/ct-bot/},
   biburl      = {https://puma.uni-kassel.de/url/cb646bb9201ef4b904707760392311e9/hotho},
   keywords    = {roboter bot robot basteln ct},
   added-at    = {2007-01-03T13:35:16.000+0100},
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@electronic{www.wiso-net.de,
   title       = {Neues wiso}, 
   url         = {http://www.wiso-net.de/IV_neu_PMGC.htx},
   biburl      = {https://puma.uni-kassel.de/url/883cbea8b2b41b33083b85057df6cf24/hotho},
   keywords    = {zeitung fulltext heise ct},
   added-at    = {2006-08-01T11:06:14.000+0200},
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