Werdnig-Hoffman Disease & Chronic Distal Spinal Muscular Atrophy with Apparent Autosomal Dom InheritAnn Neurol 32:404-407, Boylan,K.B.&Cornblath,D.R., 1992
Chronic Spinal Muscular Atrophy in AdultsJ Neurol Sci 9:551, Meadows,J.C.,et al, 1969