K. B. Mmolawa, A. S. Likuku and G. K. Gaboutloeloe (2020) “Assessment of heavy metal pollution in soils along major roadside areas in Botswana”, African Journal of Environmental Economics and Management, 8(1), pp. 638–648. Available at: https://elixirpublishers.in/index.php/ajeem/article/view/1079 (Accessed: 3 August 2025).