1. Classification of drugs according to their discriminable effects in rats;Barry,1974
2. The study of drugs with operant techniques;Boren,1966
3. Discriminative stimulus properties of narcotic analgesic drugs;Colpaert;Pharmacol Biochem Behav,1978
4. Codeine and cocainereinforced responding in rhesus monkeys: effects of dose on response rates under a fixedratio schedule;Downs;J Pharmacol Exp Ther,1974
5. Estimation of relative antiavoidance activity of depressant drugs in squirrel monkeys;Hanson;Arch Int Pharmacodyn,1966