NKOMO, Jabavu Clifford. Crude oil price hikes and issues for energy security for Southern Africa. Journal of Energy in Southern Africa, [S. l.], v. 21, n. 2, p. 12–16, 2010. DOI: 10.17159/2413-3051/2010/v21i2a3251. Disponível em: https://energyjournal.africa/article/view/3251. Acesso em: 5 may. 2025.