Degenerative Diseases of the Nervous System, Amyotrophic Lateral SclerosisAdams & Victors Principles of Neurology, Chp 39, pg 1109, Ropper, A.H.,et al, 2014
Amyotrophic Lateral SclerosisLancet 369:2031-2041, Mitchell,J.D. & Borasio,G.D., 2007