1. Über den Nystagmus und seine Aetiologie;Raehlmann;Arch. Ophth.,1878
2. Voluntary nystagmus;Campbell;Am. Homeo. Ophth. Otolaryng. Soc.,1882
3. Voluntary ocular fibrillations;Friedman;Am. J. Ophth.,1955
4. Voluntary nystagmus;Smith;J. Ophth. Otol. Otolaryng.,1902
5. Voluntary nystagmus;Friedenwald;Am. J. Ophth.,1926