1. Barbour, A.D. (1978). Macdonald’s model and the transmission of bilharzia. Trans. Roy. Soc. Trop, Med. Eyg., 72, 6–15.
2. Dietz, K. (1975). Epidemiological models. Working Paper of the Expert Committee on Epidemiology of Onchocerciasis, ONCHO/WP/75. 31, 1–3.
3. Dietz, K . etal. (1974). A malaria model tested in the African savannah. Bull. Wld Hlth Org., 50, 347–57
4. Elderkin, R.H. et al. (1977). On the steady state of an age dependent model for malaria.In Nonlinear systems and applications. An International Conference. V. Lakshmikantham, ed., Academic Press, New York, 491–512.
5. Fine, P.E.M. (1975). Superinfection - A problem in formulating a problem. Trop. Dis. Bull., 72/ 475–488.