Discordant phenotypes in twins with infantile nystagmus oleh Abdullah Aamir, Helen J. Kuht, Rebecca J. McLean, Gail D. E. Maconachie, Viral Sheth, Basu Dawar, Ravi Purohit, Nicolas Sylvius, Michael Hisaund, Alina Zubcov-Iwantscheff, Frank A. Proudlock, Irene Gottlob, Mervyn G. Thomas