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7. http://www.google.co.uk/imgresq=ringelmann+effect+in+sport&um=1&hl=en&sa=N&biw=1280&bih=669&tbm=isch&tbnid=RCPBJxaORLPWOM:&imgrefurl=http://probloggersdotorg.wordpress.com/2012/02/12/a-deficit-of-motivation-social-loafing-in-online-learning-communities (ringelmann effect)

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