5Ang M, Li X, Wong W,et al. Prevalence of and Racial Differences in Pterygium. Ophthalmology 2012 , 119 ( 8 ) : 1509-1515.
6Massaoutis P, Khemka S, Ayliffe W. Clinical outcome study of a modified surgical technique for pterygium excision. Can J Ophthalmol 2006 ,41 ( 6 ) :704-708.
