[Closed] How to know what "ReferenceTarget:ReferenceTarget" is

I made a teapot and assign it as a instance geometry in Thinking Particles.

Before it was assigned to TP, if I run “refs.dependents” on it, I got nothing.

After it was assigned to TP, I get the two following items.
ReferenceTarget:ReferenceTarget
ReferenceTarget:ReferenceTarget

My question is how can I investgate what “ReferenceTarget:ReferenceTarget” actually means.

Eventually I’m trying to get a list of scene objects which is depend on a node