V. Pieterse, D. Kourie, и A. Boake. SAICSIT '04: Proceedings of the 2004 annual research conference of the South African institute of computer scientists and information technologists on IT research in developing countries, стр. 2--9. , Republic of South Africa, South African Institute for Computer Scientists and Information Technologists, (2004)http://portal.acm.org/citation.cfm?id=1035054.