The Greeks and Romans in the Black Sea and the importance of the Pontic region for the Graeco-Roman world (7th century BC-5th century AD) : 20 years on (1997-2017) : proceedings of the Sixth International Congress on Black Sea Antiquities (Constanţa - 18-22 September 2017) : dedicated to Prof. Sir John Boardman to celebrate his exceptional achievements and his 90th birthday - Cecchladze, Goča Revazovič; Avram, Alexandru, 1956-2021‏; Hargrave, James (Archaeologist) (Archaeopress Publishing, 2021)