Friedreich Ataxia
In Rowland, L. P. Merritt's Textbook of Neurology, 8th Ed, Lea & Febiger, Phila, Ch 13, p627, Rosenberg,R.N., 1989
Visual involvement in Friedreich's Ataxia & Hereditary Spastic Ataxia
Arch Neurol 38:75-79, Livingstone,I.R.,et al, 1981