So, like others I see, I am struggling a bit with the associated references — which fortunately are not needed for the solve but which I would like to get for completeness. I don’t want to accidentally give unasked-for hints to the theme, so let’s just say that I can persuade myself that maybe that I can see references for most of the group, but can anyone hint as to where references to the members in rows 7 and 10 might be found? And the “two others”?