http://www.nytimes.com/2009/02/14/sports/cycling/14gears.html?_r=1&src=SkimTE
http://www.tanea.gr/default.asp?pid=2&artid=4502780&ct=2
http://cycle.shimano-eu.com/publish/content/global_cycle/en/nl/index/news_and_info/news/dura-ace_meets_di2.html
http://www.wired.com/gadgets/miscellaneous/news/2008/07/shimano
http://lowtechtimes.com/2008/08/12/bicycle-news-full-electronic-shifting-is-unnecessary-and-expensive/
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