Internet, http://www.achemenet.com/ressources/annuaire/annuaire.htm 20-12-2004
Information trouvée : Gitler, Haim The Israel Museum
The silver coinage of Septimius Severus and his family (193-211 AD) : a study of the
chemical composition of the Roman and Eastern issues / Haim Gitler, Matthew Ponting,
2003