1. Archaeological evidence on the use of opium in the Minoan world;Askitopoulou;International Congress Series,2002
2. Alkaloids & artifacts: Opium in the Bronze Age Aegean;Boekhoud,2003
3. Psychoactive plants in ancient Greece;Carod-Artal;Neurosciences and History,2013
4. Papaver somniferum;Duke,1983
5. Papaver species and opium through the ages;Gabra;Bulletin de l’Institut d’Egypte,1956