W. G. Shaw, M. Mathews, and J. Marais, “Holistic analysis of the effect on electricity cost in South Africa’s platinum mines when varying shift schedules according to time-of-use tariffs”, J. energy South. Afr., vol. 30, no. 4, pp. 26–40, Dec. 2019, doi: 10.17159/2413-3051/2019/v30i4a5675.