Downbeating Nystagmus & Hereditary Cerebellar Degeneration, Levin DB, et al, In Neuro-ophthalmology Update
Masson Publishing USA, INC. 1977 P 337-338., Smith,J.L., 1977
Vertical Supranuclear Gaze Palsy with Secondary Syphilis
JNNP 45:86-88, Page,N.G.R.,et al, 1982
Internuclear Ophthalmoplegia, Typical & Atypical
Arch Ophthal 84:583, Cogan,D.G., 1970