R. D. Bugan, N. Z. Jovanovic, and W. P. de Clercq, “Quantifying the catchment salt balance: An important component of salinity assessments”, S. Afr. J. Sci., vol. 111, no. 5/6, pp. 1–8, May 2015, doi: 10.17159/sajs.2015/20140196.