You may contact the author at: pprauthor [then add the at sign] googlemail [DOT] com
Sorry to be so cryptic. I don’t wish to be besieged with spam. (Dec 10 – apologies the emails appear not to have got through)
By the way, in response to early 2010 criticism of my apparent anonymity, implying that I was trying to hide behind that, I posted my name on this site for 10 months to Dec 2010. I have now taken it out again, having proved the point. It on every page but one of the 90 page pdf copy of this paper which has been widely circulated on the web. I expected that to be more fully circulated than the URL of this site.