Douglas Underwood covers Bordeaux, Toulouse and Narbonne in ‘Good Neighbors and Good Walls: Urban Development and Trade Networks in Late Antique South Gaul’, in: Michael J. Kelly and Michael Burrows (eds), Urban Interactions: Communication and Competition in Late Antiquity and the Early Middle Ages, Binghamton, NY: Gracchi Books, 2020, 373-427.
Available at Punctum Books open access