Kgosikoma, O. E., and K. Mogotsi. “Understanding the Causes of Bush Encroachment in Africa: The Key to Effective Management of Savanna Grasslands”. Tropical Grasslands-Forrajes Tropicales, vol. 1, no. 2, Dec. 2013, pp. 215-9, doi:10.17138/tgft(1)215-219.