1. 1. Rich A et al: A simplified way to remove pterygia Ann Ophth 6:739-742 1974.
2. 2. Duke-Elder S: System of Ophthalmology Volume VIII. St Louis CV Mosby 1965 p 573-585.
3. 3. Fox S: Ophthalmic Plastic Surgery 4th ed. New York G rune & Stratton 1970 p 228-233.
4. 4. Paton D: Pterygium management based upon a theory of pathogenesis. Tr AAOO Op: 79:603-61 2 1975.
5. 5. Pekar C: The aetiology and histopathogenesis of pterygium - A review of the literature and a hypothesis. Doc Ophth 31 :141-157 1972.