O. E. Malahlela, T. Oliphant, L. T. Tsoeleng, and P. Mhangara, “Mapping chlorophyll-a concentrations in a cyanobacteria- and algae-impacted Vaal Dam using Landsat 8 OLI data”, S. Afr. J. Sci., vol. 114, no. 9/10, Sep. 2018.