Retinitis PigmentosaSurv Ophthalmol 33:137-177, Pagon,R.A., 1988
An Ultramicroscopic Study of Skin & Conjunctival Biopsies in Chronic Neuro. Disorders of ChildhoodAnn Neurol 9:163-173, Arsenio-Nunes,M.L.,et al, 1981