GITLER H. – PONTIG M. – GLAUX. Collana di Studi e Ricerche di Numismatica. 16. The silver coinage of Septimius Severus and his family (193-211 a. D.) A study of the chimica composition of the Roman and Eastern issues. Milano, 2003. pp. 116, tavv. 39+17
Estimate: 50 GBP