Disorders of the Nervous System Caused by Drugs, Toxins, and Chemical Agents, DiptheriaAdams & Victors Principles of Neurology Chp 43, pg 1217, Ropper, A.H.,et al, 2014
Bilateral Facial ParalysisLaryngoscope 82:607-616, 1972, Rontal,E.,et al, 1972