1. Effects of morphine, diazepam and chlorpromazine on discrimination of electric shock;Dykstra;Journal of Pharmacology and Experimental Therapeutics,1979
2. Discrimination of electric shock: Effects of some opioid and nonopioid drugs;Dykstra;Journal of Pharmacology and Experimental Therapeutics,1980
3. Effects of morphine, levonantradol, and N-methyllevonantradol on shock intensity discrimination;Dykstra;Journal of Clinical Pharmacology,1981
4. A comparison of clonidine with morphine for antinociceptive and antiwithdrawal actions;Fielding;Journal of Pharmacology and Experimental Therapeutics,1978