1. Dissociation of supraspinal and spinal actions of morphine: a quantitative evaluation;Barton;Brain Res.,1980
2. Serotonin receptor antagonists induce hyperalgesia without preventing morphine antinociception;Berge;Pharmac. Biochem. Behav.,1983
3. Roles of serotonin and gamma-amino-butyric acid in opioid effects;Brase,1979
4. The antinociceptive action of intrathecal morphine involves the activation of a local serotonergic component in the spinal cord;Crisp;Abstr. Soc. Neurosci.,1986
5. A method for determining loss of pain sensation;D'Amour;J. Pharmac. exp. Ther.,1941