Salavert A., Zazzo A., Martin L., Antolín F., Gauthier C., Thil F., Tombret O., Bouby L., Manen C., Mineo M., Mueller-Bieniek A., Piqué R., Rottoli M., Rovira N., Toulemonde F., Vostrovská I. 2020. Direct dating reveals the early history of opium poppy in western Europe. Scientific Reports 10: 20263. DOI