Friedreich Ataxia
In Rowland, L. P. Merritt's Textbook of Neurology, 8th Ed, Lea & Febiger, Phila, Ch 13, p627, Rosenberg,R.N., 1989
Syringomyelia
In Merritt's Textbook of Neurology, Ed, Rowland, L. P. , 7th Ed, Lea & Febiger, Phila, 552-556, Mancall,E.L., 1984