1. Analyzing mechanism(s) of hallucinogenic drug action with drug discrimination procedures;Appel;Neurosci Biobehav Rev,1982
2. Increasing the selectivity of drug discrimination procedures;Appel;Pharmacol Biochem Behav,1999
3. Factors regulating drug cue sensitivity: the effects of dose ratio and absolute dose level in the case of fentanyl dose-dose discrimination;Colpaert;Arch Internat Pharmacodyn Ther,1982
4. Role of 5-HT2A and 5-HT2C receptors in the stimulus effects of hallucinogenic drugs II: reassessment of LSD false positives;Fiorella;Psychopharmacol,1995
5. A drug discrimination analysis of lysergic acid diethylamide LSD: in vivo agonist and antagonist effects of purported serotonin antagonists and of pirenperone, an LSD-antagonist;Colpaert;J Pharmacol Exp Ther,1982