http://www.businessweek.com/magazine/content/06_18/b3982010.htm
http://www.businessweek.com/magazine/content/06_18/b3982001.htm
http://www.businessweek.com/innovate/content/mar2006/id20060307_123989.htm?chan=search
http://www.makezine.com/blog/archive/2006/03/the_future_of_credit_cards_ear.html
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