You did indeed recommend it to me (http://the-lady-lily.livejournal.com/656399.html?thread=3294479#t3294479) back in January, but from my response I think it had already made it onto the radar some other way. LJ, alas, does not hold the clue to this one - it might have turned up at some point in the survey work for chapter 4 as a useful thing to read But Not Right Now.