DE VILLIERS, G.; VILJOEN, G.; BOOYSEN, H. Global warming and climate change with reference to South Africa. Some perspectives. Suid-Afrikaans Tydskrif vir Natuurwetenskap en Tegnologie / <i>South African Journal of Science and Technology</i&gt;, v. 27, n. 4, p. 294-306, 20 set. 2008.