1. World Health Organisation Expert Committee on Onchocerciasis, third report,1987
2. Thylefors B. Ocular onchocerciasis. Bull WHO 1978; 56: 63-78.
3. Longitudinal study of lesions of the posterior segment in onchocerciasis;Semba, R.D.; Murphy, R.P.; Newland, H.S.; Awadzi, K.; Greene, B.M.; Taylor, H.R.;Ophthalmology,1990
4. Ocular manifestations of onchocerciasis in a rain forest area of West Africa;Newland, H.S.; White, A.T.; Greene, B.M.; Murphy, R.P.; Taylor, H.R.;Br J Ophthalmol,1991
5. Distribution and aetiology of blindness and visual impairment in mesoendemic onchocercal communities, Kaduna State, Nigeria;true,1994