REFERENCES
- Bellhorn, R. W. (1981). In Textbook of Veterinary Ophthalmology, ed. Gelatt, K. N., pp. 649–671. Philadelphia: Lea & Febiger.
- Calkins, J. L. & Hochheimer, B. F. (1980). Investigative Ophthalmology and Visual Science, 19, 1009–1015.
- Hay, J., Hutchison, W. M., Lee, W. R. & Siim, J. Chr. (1981). Annals of Tropical Medicine and Parasitology, 75, 455–4-57.
- Hay, J. & Kerrigan, P. (1982). Annals of Tropical Medicine and Parasitology, 76, 363–365.
- Hay, J., Lee, W. R., Dutton, G. N., Hutchison, W. M. & Sum, J. Chr. (1984). Annals of Tropical Medicine and Parasitology, 78, 109–116.
- Lee, W. R., Hay, J., Hutchison, W. M., Dutton, G. N. & Siim, J. Chr. (1983). Acta Ophthalmologica, 61, 818–830.