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2. Endogenous opioid peptides;Lord;Nature,1977
3. Studies on the direct spinal action of narcotics in the production of analgesia in the rat;Yaksh;J Pharmacol Exp Ther,1977
4. Epidural morphine in treatment of pain;Behar;Lancet,1979
5. Pain relief and plasma concentrations from epidural and intramuscular morphine in postcesarean patients;Youngstrom;Anesthesiology,1982