N. Nhlapo, R. J. Lues, E. Kativu, and W. H. Groenewald, “Assessing the quality of food served under a South African school feeding scheme: A nutritional analysis”, S. Afr. J. Sci., vol. 111, no. 1/2, pp. 1–9, Jan. 2015, doi: 10.17159/sajs.2015/20140044.