1. New method of treating neuralgia by the direct application of opiates to the painful points;Wood;Edinburgh Med Surg J,1855
2. Opioid analgesia at peripheral sites;Stein,1991
3. Multiple opioid receptors: ligand selectivity profiles and binding site signatures;Goldstein;Mol Pharmacol,1989
4. Multimethod assessment of chronic pain,1987
5. Classification of chronic pain;International Association for the Study of Pain;Pain,1986