Hipondoka, M., B. Mauz, E. Nande, and J. Bezuidenhout. “Reconnaissance Survey of Radioisotopes in Soil and Possible Impact on Seasonal Anthrax Outbreak at Etosha National Park, Namibia”. International Science and Technology Journal of Namibia, June 2014, pp. 059-6, https://journals.unam.edu.na/index.php/ISTJN/article/view/1119.