so they're not just making it up out of their heads, it actually, you know, somebody really did a study on this, somebody really put this argument forward erm er partly it's to, I mean some of the things on those things you can't easily get in Aston library anyway, some of the things erm er particularly if they're references to general, you know, sort of, you know, general bits of the, you know, whatever textbook they seem to be using mostly erm 