Centeno, R.M.S. 2014. GOLD COINAGE OF GALLIENUS IN THE BEGINNING OF THE JOINT REIGN WITH VALERIANUS I: NOTES ON A MONETARY MEDALLION FOUND IN TONGOBRIGA. Conimbriga. 53, (Dec. 2014), pp. 177-199. DOI:https://doi.org/10.14195/1647-8657_53_6.