1. Multiplicative interaction between narcotic agonisms expressed at spinal and supraspinal sites of antinociceptive action as revealed by concurrent intrathecal and intracerebroventricular injections of morphine.;Yeung;J Pharmacol Exp Ther,1980
2. Multiplicative interaction between intrathecally and intracerebroventricularly administered mu opioid agonists but limited interactions between delta and kappa agonists for antinociception in mice.;Roerig;J Pharmacol Exp Ther,1989
3. Antinociception induced by simultaneous intrathecal and intraperitoneal administration of low doses of morphine.;Niv;Anesth Analg,1995
4. Antinociceptive effect induced by the combined administration of spinal morphine and systemic buprenorphine.;Niv;Anesth Analg,1998
5. Pharmacological mechanisms of opioid analgesics.;Pasternak;Clin Neuropharmacol,1993