Sibisi, NT, and JM Green. “A Floating Dome Biogas Digester: Perceptions of Energising a Rural School in Maphephetheni, KwaZulu-Natal”. Journal of Energy in Southern Africa, vol. 16, no. 3, Aug. 2005, pp. 45-52, doi:10.17159/2413-3051/2005/v16i3a3115.