Rautenbach, W, D L W Krueger, and E H Mathews. “Reducing the Electricity Cost of a Three-Pipe Water Pumping System – a Case Study Using Software”. Journal of Energy in Southern Africa 16, no. 4 (November 1, 2005): 41–47. Accessed April 29, 2024. https://energyjournal.africa/article/view/3080.