1. Barrett RJ (1986) Behavioral approaches to individual differences in substance abuse: drug-taking behavior. In: Galizio M, Maisto SA (eds) Determinants of substance abuse: biological, psychological and environmental factors, Plenum Press, New York
2. Barry H III (1974) Classification of drugs according to their discriminable effects in rats. Fed Proc 33: 1814–1824
3. Barry H III, Krimer EC (1979) Differential stimulus attributes of chlordiazepoxide and pentobarbital. Neuropharmacology 18: 991–998
4. Cicero TJ (1980) Alcohol self-administration, tolerance and withdrawal in humans and animals: theoretical and methodological issues. In: Rigter H, Crabbe JC (eds) Alcohol tolerance and dependence. Elsevier, Amsterdam, pp 1–51
5. Corda Mg, Blaker WD, Mendelson WB, Guidotti A, Costa E (1983) Beta-carbolines enhance shock-induced suppression of drinking in rats. Proc Natl Acad Sci USA 80: 2072–2076