Do you have access to journals? Searching through my school's list of articles, there's something in
"SEMIGROUP FORUM Volume 66, Number 3, 489-490 DOI: 10.1007/s002330010145" <
and
"Bull. London Math. Soc. (2001) 33 (4): 505. doi: 10.1017/S0024609301299287" <
I don't know if these are what you're looking for (they're not extremely long), and if you don't have access to the journals, I guess I'm probably not allowed to link the articles here. If you'd like me to email them to you or something, I can do that.
The material of the book is way beyond me, so unfortunately I don't have any experience with it, but I hope I could help anyway.