Müller-Dempf, Harald Department I, MPI for Social Anthropology, Max Planck Society;
http://www.eth.mpg.de/cms/de/publications/working_papers/wp0106.html (Any fulltext)
Müller-Dempf, H. (2008). The Ngibokoi dilemma: generation-sets and social system engineering in times of stress; an example from the Toposa of Southern Sudan. Max Planck Institute for Social Anthropology Working Papers, 106.