Referencing opinions that are visible in Google search results?
In my field, it is common to see this type of thing in the &quot;related work&quot; section of a paper. And it is almost always accompanied by citations. What is &quot;overkill&quot; and why are you afraid of it? Citations don't clutter a paper that much that you have to be afraid of including them.
Think of it this way, if a entry-level graduate student was reading your paper, and didn't know exactly what region modelling meant, it would be helpful to have a single paper to go to that provides a description. Especially if there is any ambiguity among terms, you can clear up what you mean by &quot;region modelling&quot; by simply including a reference.