Absolutely, it came on its own while I was trying to understand what exactly you were talking about last week here.
Good! I crave for hard problems. It's definitively not your standard QFT where I could bumble through most of the problems in Radovanovic's problem set purely on my knowledge of operators. Introductory books for plasma stretch my limits, and you can't put the price on that.
If you go down that route, we will meet, someday.
It would be cool, although with my US visa being declined, anything like that is likely a good few years away from me.