Ke, J. (2004). Self-organization and Language Evolution: System, Population and Individual. City University of Hong Kong, doctoral thesis. Available (pdf): http://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=6&ved=0CEQQFjAF&url=http%3A%2%2Fciteseerx.ist.psu.edu%2Fviewdoc%2Fdownload%3Fdoi%3D10.1.1.101.8777%26rep%3Drep1%26type%3Dpdf&ei=THIHT8z8EIetsAKzie3qAg&usg=AFQjCNE4hK2YMINJaE5O3TmUlJHayBOP0g
???