1. AYmES, S., and ANDERSON, N. P. (1932). Arch. Derm. Syph. (Chicago), 25, 89.
2. BOASE, A. J. (1945). E. Afr. med. J., 22, 271.
3. BOASE, A. J. (1947). Ibid., 24, 363.
4. Introduction to Parasitology;CHANDLER, A.C.,1955
5. Text-book of Ophthalmology;Wiley, New York DuKE-EiuER; S.,1952