Disorders of the Nervous System Caused by Drugs, Toxins, and Chemical Agents, Opiates and Synthetic Analgesic Drugs
Adams & Victors Principles of Neurology Chp 43, pg 1201, Ropper, A.H.,et al, 2014
Postherpetic Neuralgia-Pathogenesis, Treatment and Prevention
NEJM 335:32-42, Kost,R.G.&Straus,S.E., 1996