I am sure you know it... Here: http://www.amazon.com/Volatility-Tr...=sr_1_1?ie=UTF8&s=books&qid=1265133684&sr=8-1
I didn't call it a "filthy book". It's "filthy's book", because the author is known as 'filthy' to the quant community.
When trying to find the book, I did a search on AMZN for filthy and I got some really strange results. I added options, and I got almost as bad. Oh man, too funny.
This paper attempts an answer http://ferrari.dmat.fct.unl.pt/personal/mle/SF04/session5/zakamouline.pdf
BTW, I thought you might be interested to know, nitro... filthy's coming out with a new book and it promises to be quite good.