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Brandt, Simon D and King, Leslie A and Evans-Brown, Michael (2014) The new drug phenomenon. Drug Testing and Analysis , 6 , (7-8) , pp. 587-597.
European Monitoring Centre for Drugs and Drug Addiction. King, Leslie A and Sedefov, Roumen (2007) Early-warning system on new psychoactive substances: operating guidelines. Luxembourg: Office for Official Publications of the European Communities.
King, Leslie A (2004) An overview of cannabis potency in Europe. Lisbon: European Monitoring Centre for Drugs and Drug Addiction.