I'm planning on including large excerpts of publications in my thesis. I would like to highlight these in some way that would make visually clear the distinction between these sections and my newly written thesis text. These excerpts are multi-page fully formatted sections replete with typeset math and figures. My thesis text references equations and figures in these excerpts and both share the same bibliography.
What I'd like to do is to place a vertical line in the margin beside these excerpts. Is there any way to write an environment to do that in latex?