References
- Latif , A. S. , Katzenstein , D. A. Bassett , M. T. 1989 . Genital ulcers and transmission of HIV among couples in Zimbabwe . AIDS , 3 : 519 – 523 .
- Potts , M. , Anderson , R. and Boily , M. C. 1991 . Slowing the spread of human immunodeficiency virus in developing countries . Lancet , 338 : 608 – 613 .