Retinitis Pigmentosa
Surv Ophthalmol 33:137-177, Pagon,R.A., 1988
Spinocerebellar Degeneration:Hexosaminidase A & B Deficiency in Two Adult Sisters
Neurol 29:380-384, Oonk,J.G.W.,et al, 1979
Lower Motor Neuron Disease with Spinocerebellar Degeneration
Ann Neurol 2:524, Page,R.W.,et al, 1977