Sracek, O., Wanke, H., Ndakunda, N. N., Mihaljevič, M., & Buzek, F. (2015). Geochemistry and fluoride levels of geothermal springs in Namibia. Journal of Geochemical Exploration, 148, 96-104. https://doi.org/10.1016/j.gexplo.2014.08.012