NKOMO, Jabavu Clifford. Energy security and liquid fuels in South Africa. Journal of Energy in Southern Africa, [S. l.], v. 20, n. 1, p. 20–24, 2009. DOI: 10.17159/2413-3051/2009/v20i1a3298. Disponível em: https://energyjournal.africa/article/view/3298. Acesso em: 5 may. 2025.