I am undertaken a project and these achievements whether in a form of laws, innovations, and good practices on urban green spaces in Africa are of great importance to the project.
I guess you can check whether the online database of your university library or google the key words. Another way is maybe you can find some published data from government website.
1. MATTHEW MCCONNACHIE, M.; SHACKLETON, Charlie M. Public green space inequality in small towns in South Africa. Habitat International, v. 34, n. 2, p. 244-248, 2010.
2. ADAMS, Lowell W. Urban wildlife ecology and conservation: a brief history of the discipline. Urban ecosystems, v. 8, n. 2, p. 139-156, 2005.
3. ROGERSON, C. M. Towards" pro-poor" urban development in South Africa: the case of urban agriculture. ACTA ACADEMICA-UNIVERSITY OF THE FREE STATE, v. 35, p. 130-158, 2003.
4. KITHA, Justus; LYTH, Anna. Urban wildscapes and green spaces in Mombasa and their potential contribution to climate change adaptation and mitigation. Environment and Urbanization, v. 23, n. 1, p. 251-265, 2011.