Link to a downloadable/non-404 version of Hughes' paper: http://academic.research.microsoft.com/Paper/702256.aspx http://academic.research.microsoft.com/Paper/

Link to a downloadable/non-404 version of Hughes' paper: http://academic.research.microsoft.com/Paper/702256.aspx http://academic.research.microsoft.com/Paper/702256.aspx Two pdf links below the summary paragraph.