1. Comments on the Reported Statistics on Narcotics Drugs;International Narcotics Control Board,2010
2. Opioids in rheumatic diseases;Lang;Ann. N. Y. Acad. Sci.,2010
3. The effects of morphine- and nalorphine-like drugs in the nondependent and morphine-dependent chronic spinal dog;Martin;J. Pharmacol. Exp. Ther.,1976
4. Endogenous opioid peptides: multiple agonists and receptors;Lord;Nature,1977
5. Opioid receptor subtypes: fact or artifact?;Dietis;Br. J. Anaesth.,2011