1. BRAENDSTRUPP, P. (1950) Ibid., 28 (Suppl), 35
2. DOBREE, J. H. (1957) Trans. ophthal. Soc. U.K., 77, 229
3. EMERY, J. M., LANDIS, D., PATON, D., BONIUK, M., and CRAIG, J. M. (1974) Trans. Amer. Acad. Ophthal.
4. Otolaryng., 78, 290 HAYREH, S. S. (1965) Brit.
5. KLEIN, B., and OLWEN, J. H. (1956) Arch. Ophthal., 56, 207