This work was supported United Nations Development Program – Global Environmental Facility – Small Grants Programme Botswana (UNDP-GEF/SGF-Botswana), Department of Chemistry, University of Botswana main campus as well as the Okavango Research Centre Institute (ORI), Andrew Mellon Foundation and STINT (the Swedish Foundation for International Cooperation in Research and Higher Education, YR2009-7015).
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Mokgadi et al. (2013) studied this question.
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