1. Sharma, V. & Mehrotra, K. Nature 298, 210 (1982).
2. Ahktar, R. & Learmonth, A. Malaria Annual Parasite Index Maps of India by Malaria Control Unit Areas, 1965-1976 Open University, New Delhi, 1979).
3. WHO tech. Rep. Ser. No. 655 (1980).
4. WHO tech. Rep. Ser. No. 655 (1980).
5. Herath, P. & Davidson, G. Bull. Wld Hlth Org. 59, 383–386 (1981).