I couldn't find any reference with the representation theory of this specific case. I found some general stuff but never explicit computations or realizations.
The only thing I found on $SU(2, 1)$ is a little bit about its structure theory on Helgason's book (Differential geometry, Lie Groups and Symmetric Spaces).
And so I ask you, do any of you know if there is something like this in the literature (I phrase this question as a reference request because I think it would be near impossible to give an explicit answer in here)? Actually, at this point, anything on this group would be great, but I do need to know whatever is known about its representation theory.
Bonus question: 1) Refenreces on the relation of the rep. theory of $SU(2, 1)$ and $SL(3)$ 2) The relation to the rep. theory of it's Lie algebra. 3) References on actions of $SU(2, 1)$.