It's not really easily summarised so I have linked the site that caught my interest with this below, as well as the first of the guy's video lectures. In his other videos there are lectures given by other 'experts' on the same subject but I wanted to start off with this guy since he's how I came across it. I recommend viewing the site first as it's easier to see what he's talking about there (the lecture is from 2003 and not the best quality filming).
Edited by Karlis, 21 August 2012 - 03:33 PM.
corrected/repaired site source