M. J. McGill, R. J. Swap, J. E. Yorks, P. A. Selmer, and S. J. Piketh, “Observation and quantification of aerosol outflow from southern Africa using spaceborne lidar”, S. Afr. J. Sci., vol. 116, no. 3/4, Mar. 2020, doi: 10.17159/sajs.2020/6398.