{"id":"000534517","type":"article","title":"Technology and analysis of ancient gemstones. Proceedings of the European workshop held at Ravello, November 13-16, 1987","pages":"9-458","container-title":"Pact. Revue du Groupe européen d'études pour les techniques physiques, chimiques et mathématiques appliquées à l'archéologie, 23.1989","issued":{"raw":"1989"}}