1. Hereditary congenital nystagmus;Dell'Osso;Arch. Ophthalmol.,1974
2. Ocular Vertical Deviations and the Treatment of Nystagmus;Anderson,1959
3. Frequenz und Amplitude des Nystagmus;Kestenbaum;Albrecht von Graefes Arch. Klin. Exp. Ophthalmol.,1924
4. Summary of clinical presentations;Daroff,1975