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2. ASHTON, N. (1951). British Journal of Ophthalmology, 35, 291.
3. ASHTON, N. (1952). ibid., 36, 465.
4. WARD, B., and SERPELL, G. (1954). Ibid., 38, 397.
5. BEAUVIEUX, J., and RISTITCH, K. (1924). Arch. Ophtal., 41, 352.