Rehle, T., O. Shisana, V. Pillay, K. Zuma, A. Puren, and W. Parker. “National HIV Incidence Measures - New Insights into the South African Epidemic”. South African Medical Journal, vol. 97, no. 3, Apr. 2008, pp. 194-9, https://www.ajol.info/index.php/samj/article/view/13973.