Differential Diagnosis of Tremors
Med Clin North Am 56:1363, Fahn,S., 1972
Disorders of the Nervous System Caused by Drugs, Toxins, and Chemical Agents, Lead
Adams & Victors Principles of Neurology Chp 43, pg 1220, Ropper, A.H.,et al, 2014
Epidemiology of Motor-Neuron Diseases
NEJM 288:1047, Bobwick,A.R.,et al, 1973