1. AMSLER, M., DUFOUR, R., and HERMANN, C. (1943). Ophthalmologica (Basel), 106, 167.
2. BLUM, J. D. (1945). Ibid., 109, 123.
3. BOURQUIN, J. (1938). Klin. Mbl. Augenheilk., 101, 905.
4. BUCKLERS, M. (1938). Ibid., suppl.
5. BURKI, E. (1939). Ophthalmologica (Basel), 98, 311.