?COMBE, A.D. and SIMMONS, W.C. 1933. The geology of the volcanic area of Bufumbira, South-west Uganda. Geological Survey of Uganda, Memoir, 3 (Part 1): 1-150.DENAEYER, M.E. 1972. Les laves du fosse tectonique de l'Afrique Centrale (Kivu, Toro-Ankole). I. S?. 1933.