Campbell H et al.(1973), Comparison of the effects of dexamphetamine and 1-benzylpiperazine in former addicts. 'Eur J Clin Pharmacol' 6: 170–176 PMID4586849
Johnstone AC et al.(2007), Benzylpiperazine: a drug of abuse?, 'J Psychopharmacol.' 21(8):888-94 PMID17606471