1. Corneal-vascularization problems;Vail;Am. J. Ophth.,1943
2. 13th Annual Report of the Memorial Ophthalmic Society of Egypt, Giza, Cairo, 1938;Thygeson;Arch. Ophth.,1941
3. Bitot's Spots in Trinidad;Metivier;Am. J. Ophth.,1941
4. Untersuchungen über den Vitamin A Gehalt des Blutes von einigen Patienten mit A-avitaminotischen Augensymptomen;Boen Lian;Arch. f. Augenh.,1937
5. Palmer and Aykroyd: Quoted by Metivier.