http://www.slideshare.net/shawn_merdinger/we-dont-need-no-stinkin-badges-hacking-electronic-door-access-controllersquot-shawn-merdinger-carolinacon
http://www.securityinfowatch.com/Executives+Columns+%2526+Features/1316527?pageNum=2
http://www.darkreading.com/blog/archives/2010/04/attacking_door.html
http://blip.tv/file/3414004
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