See K. Koschel, “Opium Alkaloids in a Cypriote Base Ring I Vessel (Bilbil) of the Middle Bronze Age from Egypt,” Ägypten und Levante 6 (1996), pp. 159–166; and N.G. Bisset et al., “The Presence of Opium in a 3,500 Year Old Cypriote Base-ring Juglet,” Ägypten und Levante 6 (1996).
