Malahlela, Oupa E., et al. “Mapping Chlorophyll-a Concentrations in a Cyanobacteria- and Algae-Impacted Vaal Dam Using Landsat 8 OLI Data”. South African Journal of Science, vol. 114, no. 9/10, Sept. 2018, doi:10.17159/sajs.2018/4841.